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OpenStudy (anonymous):
Rewrite with only sin x and cos x. cos 2x + sin x
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OpenStudy (anonymous):
idk i dont do sine/cosine yet, sorry :(
OpenStudy (swissgirl):
\(cos(2x) = cos^2(x) - sin^2(x) = 2 cos^2(x) - 1 = 1 - 2 sin^2(x)\)
OpenStudy (anonymous):
thanks
OpenStudy (swissgirl):
ummm that wasnt the answer
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