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OpenStudy (anonymous):
find the exact value of cos 20pi/3
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OpenStudy (anonymous):
i tried this problem and cant figure it out someone help please?
OpenStudy (waleed_imtiaz):
yea its simple ...cos 20pi/3 = cos1200 =cos [14*90 -60]=-cos60=-1/2
OpenStudy (anonymous):
cos20pi/3=cos2pi/3=-1/2
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