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21 March, 16:22

What is the exact value of cos 4pi/3

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  1. 21 March, 20:19
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    4pi/3 = 4*180/3 = 240

    cos 240° 240° is in the third quadrant, and cos is - ve there.

    cos 240 = - cos (240 - 180)

    = - cos60

    = - 0.5

    cos 4pi/3 = - 0.5
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