Factoring/simplifying trig functions

austing94 said:
(1-cos^2X)/(1+cosX)

I know this is probably a lot easier than i'm making it.

Well how are you making it ? - please share your work.

Hint

a[sup:8ppjxwlb]2[/sup:8ppjxwlb] - b[sup:8ppjxwlb]2[/sup:8ppjxwlb] = (a+b)(a-b)
 
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