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OpenStudy (anonymous):
exact value of cos 17 pi/8 ? without a calculator
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OpenStudy (psymon):
Well, 17pi/8 is pi/8 radians after a full circle. So 17pi/8 is the same as pi/8. From there you could try the half-angle formula were theta = pi/4.
OpenStudy (psymon):
*where
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