The directions say to prove the identity. I understand how these two functions work, but I don't understand how to go through the process of getting from the left side to the right side.
If you are familiar with trig. identiy, you can prove from the left to the right in a much simpler way:
= tan^2x (1 - cos^2x), since tan^2x cos^2x = sin^2x
= tan^2 sin^2x