Hey ninjas! Most people think these two trig function expressions are equal after simplifying the left one, but you'll be shocked! This is true in most cases but we have to look at the domain restriction of the left! In this precalculus video, we'll uncover how we can define the domain of the original expression on the left to PROVE when and why it equals cos x! Be sure to subscribe so that you don't miss out on more helpful tips for your calc ab exam!
0:00 - Introf
0:17 - Rewrite The Expression
0:50 - Domain Problem
1:08 - Trig Function Domains
1:37 - Domain of Tan x
2:08 - Unit Circle For Cos
2:46 - Cos x Domain Restriction
4:28 - Second Domain Trap
4:43 - Sin x Domain Restriction
5:15 - Unit Circle for Sin
5:47 - Final Domain Expression
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