Laannii99 Laannii99

17-07-2016
Mathematics

contestada

What is the exact value of cos 4pi/3

Respuesta :

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

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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