Thursday
September 3, 2015

Homework Help: trig!!

Posted by Alice on Saturday, February 21, 2009 at 5:37pm.

Sin(X-y)sin(x+y)=sin^2 x - sin^2 y

work on one side only...so i worked on the right

=(sinx-siny)(sinx+siny) does that equal
sin(x-y)sin(x+y)??? help!

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