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OpenStudy (anonymous):
Find the exact value of cos 330°
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OpenStudy (zzr0ck3r):
11/12 of 2Pi = (11/6)pi
OpenStudy (anonymous):
cos(360-30)=cos 30=sqrt((3))/2
OpenStudy (anonymous):
look it as cos(360-30)
OpenStudy (anonymous):
i 4th quadrent cos is positive so \[\cos 30=\sqrt{3}/2\]
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