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OpenStudy (anonymous):
Help, find exact value of cos(-7pi/12)??
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OpenStudy (anonymous):
I got (sqrt6 +sqrt2)/4
OpenStudy (anonymous):
I don't think it's right
OpenStudy (cwrw238):
you could do it this way cos -7pi/12 = - cos75 degrees and use the compound angle formula cos 75 = cos(30 + 45) = cos45cos30-sin45sin30
OpenStudy (anonymous):
That confuse me what? @cwrw238
OpenStudy (anonymous):
What would you get if you did the problem ?
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OpenStudy (cwrw238):
|dw:1376509222033:dw|
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