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OpenStudy (anonymous):
use a difference identity to find the exact value of COS 5pi/12
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OpenStudy (anonymous):
cos(75)=cos(45+30)=...
OpenStudy (anonymous):
cosAcosB-sinAsinB cos45cos30-sin45sin30 [sqrt(2)/2][sqrt(3/2)]-[sqrt(2)/2][(1/2)]
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