Question

How do I find the exact value of cos 4pi/3?

Answer 1

Hello,


`cos ( (\pi)/(3) )= (√(3))/(2) \\\\ cos((4\pi)/(3) )=-cos ((\pi)/(3) )=-(√(3))/(2) \\\\`

Answer 2

we can use the calculator to determine the answer of finding the exact value of cos 4 pi/3. In this case, we use a calculator and set the mode to radians. The answer is equal to -1/2. We can also verify this by converting the angle to degrees which is 240 degrees. The answer still is -1/2.