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OpenStudy (anonymous):
Where does the (3/8) at the end of this problem come from? (1 / 4)(((1 + cos(4x)) / 2) – 2cos(2x) + 1) = (cos(4x) / 8) – (cos(2x) / 2) + (3 / 8)
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sam (.sam.):
1/8 +1/4=3/8
sam (.sam.):
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