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OpenStudy (anonymous):
which of the following are identities? check all that apply
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OpenStudy (anonymous):
A.tan(x-pi)=tan x B. cos(x+y)-cos(x-y)=2cos x cos y c. cos(x+y)+cos(x-y)=2cos x cos y D. sin(x+y)+sin(x-y)=2cosx siny
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