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OpenStudy (anonymous):
Find the exact value by using a half-angle identity. cos 5pi/12
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OpenStudy (welshfella):
use the identity cos (x/2) = sqrt[(1 + cos x/ / 2] where cos x = 5pi/6 = - sqrt3/2
OpenStudy (welshfella):
* correction cos (x/2) = sqrt[(1 + cos x) / 2]
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