1. The problem statement, all variables and given/known data I can't seem to figure out how to prove that (cscx - cotx)^2 = (1-cosx)/(1+cosx). 2. Relevant equations I believe I just need to do appropriate substitution using compound angle formulas, double angle formulas, etc... 3. The attempt at a solution I got as far as this 1 + cot^2x - 2(1/tanx)(1/sinx) + cot^2x = (1-cosx)/(1+cosx) Can anyone help me figure this out? Thanks in advance!!