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OpenStudy (anonymous):
prove the identity: cos(x+y) + cos(x-y) = 2cosxcosy
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OpenStudy (anonymous):
cos(x+y) = cosx * cosy - sinx * siny cos(x-y) = cosx * cosy + sinx * siny so cos(x+y) + cos(x-y) = 2 cosx*cosy
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