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OpenStudy (anonymous):
sin2x= A. 1-2sin^2 x B. 1/2(cos(a-b)-cos(a+b)) C. 2sinx+2cosx D. 2sinxcosx
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OpenStudy (anonymous):
I believe it's D.
OpenStudy (xapproachesinfinity):
well it is D. can you prove it is D xD
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