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OpenStudy (anonymous):
cos 7pi/12 I do cos (11pi/12 - pi/3 ) cos 11pi/12 (cos pi/3) +sin 11pi/12 (sin pi/3) I get (sqrt3 /2 )(1/2) + (-1/2) (sqrt3/2) so I get 0. I somehow got this problem wrong, can someone help me out ? ps. I used cos (a-b ) = cosa(cosb)+sina(sinb)
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