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OpenStudy (anonymous):
if A IS IN THE 3 quadrant and cos A = -15/17.find the value of cos 1/2 A.
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OpenStudy (anonymous):
\[cos(2B) = 2 cos^2B − 1\]In this case, 2B = A, and 1/2A = B.
OpenStudy (anonymous):
THX u sir
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