The Attempt at a Solution
This problem showed up in my class as a warm-up, and when my teacher tried to solve it for us he got stuck. I've asked a few classmates in higher level math, and they all seem to get stuck.
I myself have tried to prove the identity. I managed to simplify the right side down to (tan*cot)+(tan*cot)/(sin*cos) but I get stuck after this.
Any help is much appreciated.