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OpenStudy (anonymous):
I need HELP! 1+cos(6x)=_______ ? A. 3cos(2x) B. 2cos^2(3x) C. 3sin(2x) D. 2sin^2(3x)
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OpenStudy (anonymous):
cos(2x) = 2cos^(x) - 1 1 + cos(6x) = 2cos^2(3x)
OpenStudy (anonymous):
Thanks :)
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