HOW TO PROVE TRIGONOMETRIC IDENTITIES (ADVANCE) | TRIGONOMETRY
Channel: Numberbender
Date: 2013-11-25

This precalculus lesson shows you how to prove trig identities using algebraic techniques.  In proving some identities, remembering your factoring techniques of polynomial can help you answer most of the trigonometric identities that you need to prove.

0:10 Prove 1 + cosX = sin^2 x / (1-cosX)
1:07 Prove cos/(1+sin + (1+sin)/cos = 2cos
3:52 Prove (1+sinT)/cost = cost/(1-sinT)