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OpenStudy (jlrich):
Which of the following is an identity? CHECK ALL THAT APPLY. A. tan(x-pi)= tanx B. cos(x+y) -cos(x-y)= 2cosxcosy C. cos(x+y) +cos(x-y)= 2cosxsiny D. sin(x+y) +sin(x-y)= 2cosxsiny
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