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Example of Proof of Trig Identity

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Published on Feb 28, 2011

Precalculus: Prove the trig identity cos(x + y) cos(x-y) = cos^2(x) - sin^2(y). We use the sum angle formula for cosine, the even/oddness of cosine and sine, and the identity cos^2(A) + sin^2(A) = 1.

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