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## anonymous 5 years ago Find the exact value of the trigonometric function at the given real number? - Sin (21pi/2) - Cos (21pi/2) - Cot (21pi/2)

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1. anonymous

$\sin(21\pi /2 ) = (21\pi/2 )(180/\pi) = \sin(1890) = 1$$\cos(21\pi / 2) = (21\pi/2)(180/\pi) = \cos(1890) = 0$$\cot(1890) = 1/\tan(1890) =\cos(1890)/\sin(1890) = 0$ All you have to do is convert the angle from radians to degree by multiplying the given angle with: $180/\pi$ but if you want to convert from degree to radians then multiply by: $\pi/180$ ^_^

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