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OpenStudy (anonymous):
Use the appropriate sum or difference identity to find the exact value of cos (7pi/12)
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OpenStudy (anonymous):
cos(7pi/12) = cos(3pi/12+4pi/12) = cos (pi/4 + pi/3) = cos pi/4 * cos pi/3 - sin pi/4 * sin pi/3 go ahead.. put values and get answer :)
OpenStudy (anonymous):
ive got (sqrt2 +sqrt6)/4 is that right
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