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February 28, 2015

February 28, 2015

Posted by **Hannah** on Friday, March 5, 2010 at 5:22pm.

(cotx + cscx)(cotx-cscx)

I know that you have to foil first so

cot^2x - csc^2x and then use the pythagorean identity 1+cot^2u = csc^2u but I do not know how to simplify.

- Pre-Cal -
**Reiny**, Friday, March 5, 2010 at 5:24pmYou have the solution right there in front of you ...

cot^2x - csc^2x

= cot^2x - (1 + cot^2x)

= cot^2x - 1 - cot^2x

= - 1

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