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OpenStudy (anonymous):
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OpenStudy (anonymous):
This is a series in the interval between 0 and π/2 radians, yes? Do you recall how sine and cosine are related? (hint: one is shifted π/2 relative to the other)
OpenStudy (anonymous):
hmm this is a series r=a2/a1 common multiple r=cosx^2/cosx sin2x=2.sinx.cosx ...I find here ok thank you
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