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OpenStudy (anonymous):
Which of the following are identities? Check all that apply. A. sin(x+y)-sin(x-y)=2cosx siny B. cos(x+y)+cos(x-y)=cos^2 x - sin^2 y C. cos(x+y)+cos(x-y)=2cosx cosy D. sin(x-pi)=-sinx
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