So You Want to Learn Trigonometric Identities?

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Michel van Biezen has excellent short youtube lectures on this topic. 

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The Best Business Calculus Book

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I am in my 60's and I am studying calculus and kinematics. I need them for some advanced work I am doing. You have my permission to study both basic and advanced at the same time.   One moment I'm looking at the Introduction to Electromagnetism by Griffiths or The Evolution of Physics by Albert Einstein, and the next moment it's The Isaac Newton School of Driving or Barrons's AP Physics. Remember "learning is s'posed to be fun." You know what--I really have benefited from Youtube videos. For calculus, PatrickJMT, Dereck Owens, That Tutor Guy, and Dr. Schuster have been very helpful. For kinematics, Mrs. Twu and Bozeman Science. I watch a video or two, and then go to that section in my book. Then back to the videos again. And so on.   But how about geometry? Geometry is somewhat overlooked. But luckily, there is Khan Academy to the rescue. https://www.khanacademy.org/math/geometry For trig Patrickjmt again  and also ProfRobBob  for trig identiti...
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