So I'm working on my homework and cannot figure out how to verify this identity.

The instructions on the worksheet are simply to verify that the identity is true.

The equation is;

(sec(A)-tan(A))^2 = (1-sin(A))/(1+sin(A))

I can work with either the left or the right side to verify it, but neither seems to really be helping me out with this problem.

I've worked though several different starting points and keep hitting dead ends.

If someone could help me or at least help me get started in the right direction that would be wonderful.

Thanks in advance!