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caylus
Hello,

[tex]cos ( \dfrac{\pi}{3} )= \dfrac{\sqrt{3}}{2} \\\\ cos(\dfrac{4\pi}{3} )=-cos (\dfrac{\pi}{3} )=-\dfrac{\sqrt{3}}{2} \\\\[/tex]
meerkat18
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.