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OpenStudy (anonymous):
cos 1 over 4 pi over 13
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OpenStudy (anonymous):
apparently my calculator is in the wrong mode
OpenStudy (anonymous):
\[\cos 1/4\Pi/13\]
OpenStudy (anonymous):
One here means 1 radian (a type of angle- there are 2pi radians in 360 degrees, so 1 pi is 180 degrees, so cos(1) radian=cos(180)=-1)
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