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OpenStudy (anonymous):
Help me with this problem please? which of the following are identities? check all that apply. A. cos(x+pi/6)=-sin(x-pi/3) B. tan(x-pi/4)=tanx-1 C. tan(x)-tan(y)=sin(x-y)/cos(x)cos(y) D.1-tan(x)tan(y)=sin(x+y)/sin(x)sin(y)
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