What is the exact value of cos 4pi/3

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17-07-2016
Mathematics

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What is the exact value of cos 4pi/3

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olemakpadu olemakpadu · Answer 1 · 2016-07-17T03:32:53+02:00

olemakpadu olemakpadu

17-07-2016

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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NellySan NellySan · Answer 2 · 2020-12-16T17:23:29+01:00

NellySan NellySan

16-12-2020

Answer:

-1/2

Step-by-step explanation:

The person above explained it perfectly. It's B (or -1/2) on ed2020

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