I'm stuck on the following problem:
sin(a) - csc(a) = -cos(a)cot(a)

Here is what I've done:
On the left side I get:
sin(a) - 1/sin(a) -->
* both by sin(a) to get sin^2(a) - 1

On the right side I get:
-cos(a) * cos(a)/sin(a) = cos^2(a)/sin(a)

I'm stuck at that point. I'm relatively sure I've got the left side
correct, but the right side is kicking my posterior.

Thanks for all assistance anyone can give.
Allison