Simplifying w/ pythagorean relationships

[Messagehelp]

Hi! I need help with this problem:
csc x - cos x • cotx

I understand the pythagorean relationships but I just never really know where to start.
Thanks!

 

[wjm11]

Hi! I need help with this problem:
csc x - cos x • cotx

I understand the pythagorean relationships but I just never really know where to start.

Put everything into terms of sine and cosine, and the answer should be obvious.