Fundamental Trigonometric Identities Intro & Proofs

I introduce and prove the Fundamental Trigonomic Identities...the Quotient Identities, Reciprocal Identities, and the Pythagorian Identities. I like this tip!!! Darren Bonura: My teacher taught us "No Co-Co" as in Cosine doesn't equal Cosecant. Just a helpful way to remember it. That way Cosine has to equal Secant and thus Sine equals Cosecant. Check out http://www.ProfRobBob.com/, there you will find my lessons organized by class/subject and then by topics within each class. Find free review test, useful notes and more at http://www.mathplane.com/ If you'd like to make a donation to support my efforts look for the "Tip the Teacher" button on my channel's homepage    / profrobbob