SOLUTION: Prove the following identity: -sin^2x-sin^2y+1=cos(x+y)cos(x-y)
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Question 177042: Prove the following identity: -sin^2x-sin^2y+1=cos(x+y)cos(x-y)
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!
Edwin
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