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OpenStudy (anonymous):
cos(-5pi/4)
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OpenStudy (anonymous):
-5pi/4 * 180/pi = -900/4 = -225 360-225 = 135 ( Quadrant II) therefore answer will be neg. Cos(135) = - sqrt{2}/2 (exact value)
OpenStudy (anonymous):
WOW YOUR GREAT AT MATH
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