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Laannii99 Laannii99
  • 16-07-2016
  • Mathematics
Answered

What is the exact value of cos 4pi/3

Verified Answer :

olemakpadu
olemakpadu olemakpadu
  • 16-07-2016

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

Answer Link
NellySan
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

Answer Link

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