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OpenStudy (anonymous):
1 + cos(18x) = _____. A. 2sin^2(9x) B. 2sin^2(18x) C. 2cos^2(9x) D. 2cos^2(18x)
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OpenStudy (anonymous):
@SolomonZelman
OpenStudy (anonymous):
C. 2cos^2(9x) sorry, i can't do the transformation for you, I have to go.
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