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Mathematics
Ernesto Mckenzie
21 March, 16:22
What is the exact value of cos 4pi/3
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Madelynn Figueroa
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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