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OpenStudy (anonymous):
rewrite sin^4 (x/2) in terms of the first power of cosine
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OpenStudy (anonymous):
do you know what sin^2(x) equal to?
OpenStudy (anonymous):
no
OpenStudy (anonymous):
sin^2(x) = (1/2) (1 - cos(2x)) so what do you think cos(x/2) equal to?
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