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OpenStudy (anonymous):
cos-1(-square root of 3/2)
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OpenStudy (anonymous):
30 degrees
OpenStudy (anonymous):
its a special angle
OpenStudy (chosenmatt):
yup ^^^
OpenStudy (bradely):
cos-1(-square root of 3/2) = cos-1(cos 150) =150 Source: http://www.mathskey.com/question2answer/
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