SOLUTION: Find the exact radical form of cos 4pi/3

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Question 842416: Find the exact radical form of cos 4pi/3
Answer by lwsshak3(11628) About Me  (Show Source):
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Find the exact radical form of cos 4pi/3
4π/3=reference angle of π/3 in quadrant III in which cos<0
cos(4π/3)=-cos(π/3)=-1/2