when teachers say memorize this it is so annoying, because ideally you should memorize very little; everything else should follow naturally from what little you did memorize

This man has confirmed my belief that if you are telling your students to memorize concepts, you do not understand them yourself and should not be teaching them.

@CharlesIsabirye

Ай бұрын

Agreed

@hc3550

19 күн бұрын

in psychology this is called confirmation bias :) glad I could help.

I've been teaching mathematics for 32 years. This is simply the best introduction to Trig I've ever seen. I did not hesitate to share this with my Precalculus students. Thank you.

@rul1175

6 ай бұрын

I needed to read this; I'm about to take pre calc in college and I wasn't sure if this will be part of the class.

@CharlesIsabirye

Ай бұрын

Indeed you are one in a million 🙂

NEVER in my life (and I am 75) have the fundamentals of trigonometry be shown to me in such a clear manner. Thank you so much ! Greetings from Belgium, Patrick WOUTERS.

@Aboody92

Жыл бұрын

same here

@ExtrovertedCenobite

Жыл бұрын

And yet you made it to 75 just fine without seeing it in a clear manner.

@ronnfoxx8472

Жыл бұрын

i said the same thing

@tedpatriot2963

Жыл бұрын

@@ExtrovertedCenobite yah but imagine had he learned this in his teens he could have conquered the world!

@ExtrovertedCenobite

Жыл бұрын

@@tedpatriot2963 I know of many who have mastered many fields and have not conquered the world.

Sir, you are a legend and hero in the eyes of every student who watched your video after spending years living in fear of the trig and the unit circle.

@DennisDavisEdu

2 жыл бұрын

What a nice thing to say! I'm glad you found it helpful.

@amgsworld2617

Жыл бұрын

Absolutely!

@KRBhaidoomer1

Жыл бұрын

@@DennisDavisEdu Really precious scenes♥️

@WyMustIGo

Жыл бұрын

@@DennisDavisEdu Now if only someone can teach these young WOKE fools that only two genders exist, and that thinking otherwise means you're an idiot.

@lalilali5782

Жыл бұрын

ONG 😤

After 3 separate trig classes, this is the first time I've actually intuitively understood how the unit circle works, and haven't needed to memorize things to get through tests and assignments. I wish all math teachers would teach as clearly and concisely as you do.

@mohinderkumar7298

Жыл бұрын

90% are incompetent

@ull893

Жыл бұрын

Only if they themselves knew what they are teaching. Many are teaching from rot memory.

"I'll never use this in my lifetime, so why do I need it?" Me, in 1986. Fast forward to 2008, used the 3,4,5 method to check a wall to see if it was square. I think I saw it on This Old House, lol. Use it all the time now. I use angles every day as a carpenter. I try to keep learning, so in the mornings, I watch how-to videos. I love math. I love the look and design of the math equations and every day I learn something. Thank you for the visuals. That is a huge help.

@simpleman283

Жыл бұрын

As a carpenter I used the 3,4,5 for nearly 8 years till an electrician friend taught me the Pythagorean Theorem. That opened up a lot for me, but when I started learning this trig stuff on youtube I really felt like a fool. My teachers were so bad in school, I never got past pre-algebra. Anyway here is link to a 8 minute video I thing you would enjoy. kzread.info/dash/bejne/dqeamKN9p62cZqg.html I found it in the comment section.

@TheAstriapo

Жыл бұрын

@@simpleman283 That video is pure poetry. Wow!! Amazing. My schooling was the same, but I always loved math and physics. There is a mystery there and I'd love to figure it out. lol if that makes any sense.

I took trig my first semester in college. Six years later, I went back to college to finish up. In my Calculus class, they ran a quick quiz the first day. It said I had a 30% chance of passing. A friend came over for supper that night and he drew out this information for me. I posted it above my work desk. It made all the difference! I very nearly got an A that semester in Calc 1. Visualization and memorization can work together to make you a master of this information.

omg, so this is what they mean that math is easy as long as you really understand it. every explanation has explanation holyshit feels good

THIS. IS. BEAUTIFUL!!! The applied mathematics approach is the only real way for many of us to learn. These basic foundations really help improve my CMM and GD&T knowledge. I'm SO happy to have found this series and cannot wait to jump into the Statistics course before taking my Six Sigma exam. Thank you so much for taking your time to do this and I hope that your channel grows so that we have more resources like this! You and TheOrganicChemistyTutor are changing the game!

@DennisDavisEdu

5 ай бұрын

Thank you very much ButtonMasher! I'm glad you find my videos helpful and your kind words mean a lot to me.

@hamzatalib1551

Ай бұрын

​@@DennisDavisEdu​ I must say so too, I'm impressed and very thankful. Just started 10th, and very afraid of trigonometry, and u cleared the whole chapter for me before my teachers even got to try. Even if they do, they would just drag on the chapter for 2 weeks where all the students would be told to memorize everything, but in just half an hour, you cleared the whole chapter without telling me to memorize anything, u definitely earned a subscriber

Best trigonometry class that I have ever sat in, man, we were never taught like this at all, it's like our teachers never wanted us to understand this concept or maybe they never understood it themselves in the first place so we're doomed. Long live Sir Davis.😊😊

@aquarius4953

Жыл бұрын

Or maybe they said the same thing but you didn’t listen to them.

@mikemondano3624

Жыл бұрын

Just an intro. Spherical trigonometry will be on the test.

@theunusual7631

Жыл бұрын

@@aquarius4953 Or maybe the teacher had explain it, but in a complex way that the students are confused.

@qaiser648

Жыл бұрын

@@aquarius4953 nah

@Lluks4

Жыл бұрын

@@aquarius4953 you sound like a frustrated teacher

Mr Davis I’m a medical doctor, which always been interested in mathematics physics calculus and such, my late father was an engineer maybe that is why I’m interested in this. For what I remember when I was in high school I was never been explained this concepts as you are doing here, now I’m hooked to this Trig series as a high school kid It’s always fantastic to learn something new, but it’s even better to perfectly understand the concepts the way you explain them Thanks a lot!!! Wish we had internet and KZread when I was a kid

I went from having almost zero knowledge of what trigonometry is to having an incredibly intuitive understanding. Thank you.

@rpruneau68

3 ай бұрын

Wait til you experience Trig Identities

@joaomane4831

Ай бұрын

It's incredibly easy. I don't know what about it trips people up. It's literally memorizing formulas and algebraic manipulations of said formulas.@@rpruneau68

First time - I understand this on a visual matter. Instead of learning formules without knowing what I was learning. I agree with another respons that you should have 1M views for this YT video.

FLASH CARD/CHARTS/FORMULAS TIME STAMPS 5:43 trig functions (SOHCAHTOA) 7:39 trig functions (reciprocals) 11:18 quadrants (Cartesian Plane) 14:49 chart (Radians) 20:13 formula (Pythagorean Theorem) 24:42 3 numbers (Unit Circle) I saved your trigonometry course and I will try to finish it. Despite some of the math I will study would not be use in my daily life someday. I still would love to be enlighten and enjoy learning with it.

@JeremyMcElhone

4 ай бұрын

Thank you for the time stamps! Very helpful. :)

@tuneboyz5634

2 ай бұрын

@@JeremyMcElhonegood luck for your exams lil Jeremy :)

This video is a masterpiece! It deserves to be running on continuous loop in the Metropolitan Museum of Art.

You, Mr Davis, Sir, are an absolute genius! You are able to teach a not-so-easy and intimidating concept to make is as easy reading a road map by using its legends!! I'll gladly pay to join your Trigonometry classes (probably other math classes, too). Thank you, thank and thank you again!!

@DennisDavisEdu

2 жыл бұрын

Thank you so much, I think I'm blushing!

@calvertwilliamson4721

2 жыл бұрын

@@DennisDavisEdu You have what many instructors lack which is the ability to teach knowledge to others. Thanks for sharing, but I would purchase a course from you.

@pdjibril

Жыл бұрын

I agree 100%

@Amplifymaths

11 ай бұрын

Sir excellent.. Which software are you using?

This is the first time I’m commenting on a KZread lecture video and that’s cos I’m beyond wowed. This is hands down the best lecture I’ve had in my life. Thank you! 🙏🏽

I swear my teachers just show how to solve problems, NOT how to understand them, and understanding is the basis of higher maths. Thank you so much for this video. It helped alot and is an incredible source of knowledge and understanding.

Just a stunningly great tutorial. So many kids in 99% of high school literally quit school, because poorly taught math courses like Trig rips their soul. This should have 1 billion views. Your video should be a pre-requisite for ALL middle and high school math teachers, and ALL Freshmen college students. Seriously!!

This golden content, keep it up! With this single video (and without taking notes) I fully understand the concepts you have explained just by watching this video once! This is amazing, this deserves tons of appreciation. Keep it up!

@DennisDavisEdu

2 жыл бұрын

Wow, thanks! You gave me a boost for the day!

@Weedwacker112

2 жыл бұрын

@@DennisDavisEdu Your welcome, keep up the great content!

The best explanation I've seen on KZread by far. I wish I saw this before my trig class started!

Videos like these are the reason I watch KZread.

Mr Davis, Thank you for making this so clear in this step by step "unit by unit" manner. You present each concept to the viewer as if they have little to no understanding, and tip-toe through each. Absolutely fantastic. Please keep your videos coming.

11:35 imo, this would have been a good spot to shoehorn the "right hand rule" in as a memory aid for the direction that the angle sweeps positive as that is also a very fundamental concept much later. "Just point your right thumb at yourself and notice the direction your fingers curl". This will also address any potential ingrained mental bias towards clockwise motion.

This is the first time I’m commenting on a KZread lecture video and that’s cos I’m beyond wowed. This is hands down the best lecture I’ve had in my life. Thank you!

Unreal. Days spent memorizing, because that’s what the teacher told us to do. But it’s this easy. Watching this one time gave me a better understanding of trig than all my years of school. Thank you.

The way you are able to see patterns and explaining them really helps me with understanding this. Thank you!

Dennis, I'm 62 and this was my introduction to trigonometry. I failed algebra 1-2 and never made it to trig or calc. I grew up in a family of engineers. I used your pattern technique to memorize my multiplication tables. Couldn't remember the individual combinations of numbers but I could round things to fives and tens, extremely quickly. Your cheat isn't original but you're the first person I've ever met that taught math that way, Thank you. I went into the field of horticulture, plants. Landscaping, particularly the Japanese garden, fascinated me. It is a universally loved form of art in my field. Geometry is my native mathematical language in my head, All I see is patterns. Turns out the Japanese Gardens magic is tied up in endless triangles. Once you can visually dissect the design all you can see is the triangles. Somehow they figured out how to landscape in trigonometry. Countless acquaintances have told me I would have loved trigonometry. I would have. Thank you for tying a lifetime of interest together into one handy bow. Mark Barton

@DennisDavisEdu

Жыл бұрын

What a nice story, Mark, thanks for sharing!

I’m an English as a second language teacher. I love these memory hacks. It helps to give first time learners edge of confidence that they could learn further. Truly the heart of a teacher.

7:40 - "Whatever you can memorize, you will easily forget. But what you know how to figure out, that you can do forever." 👏

@DennisDavisEdu

2 ай бұрын

The key to everything.

@Imawiggle

2 ай бұрын

We learn best through Discovery… NOTHING beats experience …❤

I salute you sir.No teacher has specified those xy coordinates as you did.They just draw the circle and give those figures.

Watching this video solidifies in my mind, just how much time was wasted going to school. I was stuck in Trig for 4 years, never understood it as well as I have now in this short 30 minute video. I appreciate what you're doing to help accelerate our up-and-coming generation. I just hope it isn't too late.

Highly recommend. You will never have to memorize the Unit circle again. Brilliant way to teach. Thank you very much.

@sucdilucky3795

2 жыл бұрын

But I still try to memorize it 😩

@jayt675

2 жыл бұрын

@@sucdilucky3795 try it a few times. it might help.

@DennisDavisEdu

2 жыл бұрын

There's not as much to memorize in trig as you might think. If you understand the concepts, you can figure out most things quickly and with less stress than memorizing. And you enhance your understanding!

@jayt675

2 жыл бұрын

@@DennisDavisEdu Yes, agreed. After I watched your video a few times, I started to understand the concepts.

Words can’t describe how this video helped me understand the concept of trig functions further. Thanks a ton!

I've been out of high school for 19 years, and I stumbled upon this video. I am still absolutely blown away by mathematics and the relations of numbers to each other. Thank you for this lesson.

Daniel, I wish I could take this video back in time 20 years. You made me understand what took me over 24 months back in high school to memorize so I could pass an exam, and you did it in five minutes.

I didn't think you'd make it but you came through. You got me over a difficult hurdle.

I’m just letting you guys know that I’m not even in school for anything, I’m watching this because it’s available and that’s what I find wonderful. This person for free made this and has probably warranted someone a career that pays them 100k$+.

the perfect tone, perfect pace and perfect representation.....thanks for this simplified tutorial

You have no idea how much you have helped me. I'm taking a fast paced TRIG class in college and haven't done trig since junior year in HS and was completely lost until this. The course is suppose to cover all of trig in 5 weeks :/

This was more helpful than my last 3 math teachers. *Thank you.*

I was an extremely good math student in high school. Won math tests and stuff... not braggin'... maybe braggin' a little. Anyway, I took calculus 2 in high school, but there was only one class that ever really frustrated me... trig. Trig was the first class that felt like memorization and math to me has always been about conceptualization... not memorization. Anyway, I had to develop the conceptual tools myself, and it was the hardest math class ever for me... I wish I'd seen this video when I was taking trig. My advice to anyone... watch this video enough times that you understand every single word. If you can wrap your brain around this video, you will be able to pass an end of course trig exam. You will only need a few more conceptual tools and memorized formulas to ace it. This video is enough framework to get you most of the way through the course. Fantastic job Mr Davis. Don't take this video down. When my kids are old enough, they WILL be watching this video.

Learnt this area of mathematics 50 years ago. The teachers then did not introduce the subject in the way you have done. They just started off with the definitions and jumped into problem solving. Such method was a nightmare to students. Your way is simple and lucid.

after years of my life spent not understanding trig, this video finally made it click. i’m a visual learner and have a hard time with math because of this, but your teaching style makes it so much simpler to understand! THANK YOU!

@DennisDavisEdu

2 жыл бұрын

I'm a visual learner too Paisley. I'm creating videos I wish I could have seen when I was in school. I often thought "If only someone would have explained it this way I would have understood much better!" So that's what I'm trying to do! I'm glad you found it useful. I've just posted a full trig course that goes into more detail and follows the same graphical teaching style. Happy learning!

Thank you! This video is incredible. Not only it demystified trigonometry but now I actually understand. Like someone else mentioned, this is "Gold Standard" teaching.

Thanks for continuing to say "don't memorize." As you say, knowing how to derive the details makes this SO much easier.

the last part with the small, medium, large is a big help. That is really easy to remember and use. I was struggling with trig when they appear on graphing problem in class, now I feel like I can solve them on my own. Thank you very much!

Sir you are amazing. You have demystified trigonometry in 30 mins. I must say that I am now in love with trigonometry. Sine, cos and tan have now their own personalities. They are tangible and very much useable. I wish calculus and imaginay numbers could also be conceived like this.

Excellent method of teaching , should be the " Gold Standard "

@AynRand1967

2 жыл бұрын

Agree

@refreshist4821

2 жыл бұрын

Should be the standard

Wow, this was amazing. The calm voice, clear explanations and easy rules of thumb. Awesome!

Upon completing grade 13 trig I doubt that these concepts were this clear in my mind. An art, good teaching.

This is such a phenomenally informative video. The visualizations make trig easy to learn. I am very pleased with this quality content.

Thank you so much for this. 13:14 I never was taught that, instead I was taught to remember some formula on how to convert form rad to degrees but never got an explanation why

This was a great supplementing tool for a lot of what I learned in Precalculus so far! No more drawing out unit circles for me! Visualizing Pythagorean theorem also never occurred to me before. I'm excited to put this all into practice and save some time. Big ups! 🙌🏻

Sir, im father aged 45 of a boy from India who is in grade 10 and i amazed if i could see it when i was in his age. My son finds it helpfull too. Hat's off to u sir.

Hey Dennis - Where were you 55 years ago, when instruction like this would've changed my life! I am so jealous of the Kids these days with their access to Instructors like you and the clarity of that instruction. Now I'm using this to catch up, review and explore so many new and exiting fields of interest. Thank you so much.

@DennisDavisEdu

2 жыл бұрын

Thank you Mark for those kind words. It's never too late to learn something new! I agree with you: Today anybody can learn anything they want for free. Not at all like when we were kids.

@75blackviking

Жыл бұрын

I know what you mean. I scour youtube for content like this. It's pure gold.

Excellent stuff!… I can appreciate the sheer number of hours it must have taken to produce this. Subscribed!

Excellent. I love your emphasis on knowing how to visualize things rather than memorizing.

Oh my God! I hadn't expected this video to happen. It has helped me with a mountain of exercises since I was in 12 grade, a junior high school, I had learned Physics in general, and trigonometry in particular. At that time, I was stuck by the death circle, 'cause I couldn't remember the numbers well. But when I watched Dennis Davis's video, I completely changed my mindset to the Trig. It's easier to have a deep understanding, and, of course, Davis I'm now always visualizing not memorizing as you said! Anyway, Thank you so much for making an incredible video!

very underrated, very good content. keep up the good work!

Thank you for the high quality lesson! It helped a lot!

3 Years later, and you're still saving lives with these videos! THANK YOU!

Simply brilliant! Clear, systemic and direct. Congratulations

This deserves millions of views. My teachers told me to cram T-raios without explaining what they actually are, and that's where this becomes annoying. Thank you very much for providing such a great video learning by visualisation and understanding can make anything easier.

@mikemondano3624

Жыл бұрын

T-raios are my favorite cereal. A little milk and sugar and Great!

@bob-ny6kn

Жыл бұрын

Why, when there is so much more to life than videos repeating grade school classes?

@basavaraj1684

2 ай бұрын

Well my math teacher at school does the same.

Excellent presentation. I never had Geometry and was homeschooled and now I'm in college trig. This tutorial is a lifesaver and better now than never although I wish I'd seen it 2 weeks ago before class started. Appreciate you creating this content and look forward to watching your other vids.

@mikemondano3624

Жыл бұрын

Yeah, "homeschooled" means you'll be behind for the rest of your life. Sad, really.

@isaacmalik3714

Жыл бұрын

homeschooled lol

I'm studying for my FE exam and never in my life have I ever understood trig this well. I wish these sorts of videos existed years ago when I struggled with math in high school through college. I love the concept of visualizing because I'm a visual person and most teachers don't teach that way. I felt like I always needed to memorize things I didn't even understand completely because I could not see it in my head. From the explanation of a radian, and seeing how and what it is and showing us the break down of the degrees vs the radians to the unit circle explanation was the best! I remember in one of my math classes I would spend forever either memorizing the unit circle or squeezing it into a corner on my cheat sheet lol. I always wanted to know the whys and teachers don't usually teach the whys or show us how we got certain values such as the ones on the unit circle. I'm looking forward to learning from more of your videos.

excellent! these are the same sorts of tricks I came up with to avoid memorizing things too. It's not laziness, it's about being practical. I recognized in high School that I would never remember everything forever, and that the less I had to memorize, the more likely I would remember it long term, and focused instead on being able to use those basic core concepts to recreate or solve for anything else I needed later on. I didn't learn the concept of "first principles" until well over a decade later in life, but that's basically what we came up with.

Thank you. Now I can flex my math skills in trig this new school year when Im taking trig

Best video ever. Sir, you're an absolute legend. I'll rewatch this video many times from now on. I could understand in two days a topic that I was so afraid of for months. I'm actually in precalculus and I this has saved my life. Thank you, sir. I'll watch your other content and subscribe! Hope you continue being a math hero! 👏🙌

@DennisDavisEdu

2 жыл бұрын

Thank you Manuel for your kind words. I think my big Trig series (see description for link) is so much better than this video, but this one gets all the views and nice comments. That series has 80 videos right now, but every day this long-form overview video gets more views than those 80 combined. Well, the customer is always right! Thanks again, I'm glad you were able to overcome your fears. A little knowledge can give confidence, and confidence fights away the fear!

Thank you. Took trig as a jogh school junior. It helped me to understand construction and also ballistics used by the US Marines and sailors

This video is exceptional and the best one I've ever seen - it's clear and easy to comprehend and remember

Gonna comment to boost the algorithm. One of the best math vids out there. Thank You!

Why this guy has only 125 subscribers?! Really brief, clean and complete explanation!

@robertoteran5442

3 жыл бұрын

probably because he has only two videos. why woud someone subscribe to an account with no more content

@DennisDavisEdu

2 жыл бұрын

I have posted more videos now.

@jonathanxdoe

2 жыл бұрын

@@DennisDavisEdu glad to hear that!

I'm nearly done with my math degree and I've been using trigonometric functions and the unit circle literally everyday for years. I came here to learn the basics so I can use trig identites, differentials, and integrals without memorizing. This is such a good foundation. thank you

Wow. I thought I was the best teacher when it came to introducing the ideas of trig so as to not be intimidating, seem like common sense, and easy to remember (by simply figuring out.) After 30 years of this, I take off my hat, and bow to the man who has bested me.

The basics of Trig are no longer a conundrum. This video is an absolute GEM 💎

I am an artist and have been intimidated by math all my life. This makes at least the introduction to trig manageable. Thank you for explaining it in such a visual and clear way.

@rampakeshbharat1938

Жыл бұрын

Mathematics cannot intimidated anyone, ones' mindset to the subject is the issue...

I started a n OU maths starter degree but didn't have the basics to be able to understand it. This has filled in the blanks. Thanks❤

fourth year math undergraduate, worked with discrete math for a while but taking an interest in analytic geometry and this was the perfect reintroduction to trigonometry, thank you!!

This video on trigonometry turned out to be the most understandable and informative of all that I have seen before. I did not even notice how 30 minutes of the lesson had passed, while I was absorbing the information with interest

You have my respect! I am 70 years old and I wish my math teacher had shown your methods, we were always being told to memorise, memorise, memorise! Can’t beat a little brain exercise!!!! Thank you very much!

@DennisDavisEdu

Жыл бұрын

An ounce of understanding is worth a pound of memorizing!

@xjam879

Жыл бұрын

If I had watched this in high school, I probably would’ve Aced the class! The visuals are excellent. Thanks again! 👍

Best video on trig ive ever seen. I built all my trig from this10 years after high school. If i were to create a course or channel this is what i hope to emulate.

outstanding sir i was very much stuck at sea without a paddle and now i feel like i was over thinking most of it. one of the best maths videos i have come across. Thank you.

Thank you! Why you stopped making more??? Your teaching is just amazing... you should go ahead ... you will rock!! (:

I was only taught the sin, cos and tangent. While I knew about the other three, I was never introduced to or used them. Thank you for a most informative class!

@jandejongh

Жыл бұрын

Me too, and happy with it. Why introduce yet another function name for say 1/sin(x)? For me sin, cos and tan, their series expansions, the complex exponential and Euler's identity are all trig I bother to remember.

This is by far THE BEST explanation on Trigonometry I have ever seen in my life!

I'm 50 years old and I back in high school, I had to repeat Algebra so, I never had trigonometry. I really wish I did because I think this is a fascinating subject. Good thing for KZread and videos like this made by someone who knows and can explain the subject, to make it possible. Great video!!

You did a fantastic job explaining everything! Thank you very much for all the work you put into the video it helped a lot!!!

@DennisDavisEdu

2 жыл бұрын

Thank you Valadez, you lifted my spirits for the day!

Thanks I never knee the sin and cos were derived from soh cah toa, where hypp = 1 so it can be ignored. Very cool thank you! Just memorizing 1 circle = 2π radians :)

Thank you so much! You really made it so simple, I wish i had teachers who could explain at lest half of how well you explained here. You are just excellent.

I was about to give up on trying to find someone who could break it down. You are the best.

Whithout Visualisation this gave me a Headache.. Now are you here to give me Nightmares !! 😂😂😂

My new trig series has been posted... kzread.info/dash/bejne/gHZ3lryvc9eYfMo.html It is a series of 46 mini-lectures with (I think) improved style and clarity. It is more in-depth than this simple overview. Dennis

@DeionBonner

2 жыл бұрын

Is this still essential or should I skip this and start there?

@DennisDavisEdu

2 жыл бұрын

The series won't be completed for some time, but it is much more in-depth. This one covers the essentials, but I had to leave some stuff out, like the most famous equation in trig: cos²θ +sin²θ = 1. For quick overview, stay here, for more in-depth, see the series. Or watch 'em all!

@DeionBonner

2 жыл бұрын

@@DennisDavisEdu Decided to watch both 🤷🏾‍♂️

@suyapajimenez516

2 жыл бұрын

I’m kind of loving this channel. TVM professor David

@Sebb-hc1il

2 жыл бұрын

What would I do without you?

This is the most visual-spacial / logical step by step explanation that every student needs. This is exemplary.

Early childhood education needs to be flooded with these kinda teachers.. the world will be a better place 🙂, A nation of thinkers given such a stepping stone breeds better scientists

Dennis, thank you a lot for this video. Wish I had been taught trig like this many years ago, everything was laid out so clearly!. You're an excellent teacher, greetings from Buenos Aires - Argentina.

Professor Davis, thank you for a solid explanation of the classic Trigonometric Concepts in old fashion Mathematics.

This video is a LIFE SAVER. I couldn’t grasp the concept of the unit circle but this video explains it clearly. THANK YOU

Very well presented! Excellent use of GRAPHICS and COLORS...and GREAT VOICE, too. THANK YOU 🙂