I can't seem to figure out how to prove that (cscx - cotx)^2 = (1-cosx)/(1+cosx).
I believe I just need to do appropriate substitution using compound angle formulas, double angle formulas, etc...
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!