How to Simplify Trigonometric Expressions Using Trig Identities

This trigonometry or precalculus lesson is showing you how to simplify trig expressions using trigonometric identities. In solving this math problems in trigonometry, it is important that you have the trig identities or formula so you can modify some of the trig functions into terms that you can simplify. Your skills in factoring some polynomials is also needed in working on this math problems.

1:59 (sec x)(cos x)
2:48 (cot x)(sin x)
3:30 sin^2 x + cos^2 x
5:10 1 + tan^2 x
6:04 tan x / sec x
6:44 (tan^2 x)(csc^2 x)
7:42 sec x - sin x • tan x
9:47 sec^2 x - 1 / sec^2 x
11:05 (cos x)(1 + sec x)(1 - cosx)

Trig Cheat Sheet: https://vikingsseason5i.com/wp-content/uploads/2018/06/trig-identities-cheat-sheet-023b77e9ff383e43f1dadf5413b5faf8.jpg