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OpenStudy (anonymous):
Use a half-angle formula to rewrite (cos2x)^2 using only a cosine function to the first power. Please help!
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OpenStudy (jotopia34):
something that comes to mind, is where sin(2x)=2sinxcosx try rearranging this one to isolate cosx. Not sure if that is acceptable. i Gotta work it out first
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