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How do you evaluate $cos (\frac{4 π}{3})$ $cos ((4pi)/3)$ ?

1 Answer

Harish Chandra Rajpoot

Jul 3, 2018

$- \frac{1}{2}$ $-1/2$

Explanation:

Given that

$cos (\frac{4 π}{3})$ $\cos({4\pi}/3)$

$= cos (π + \frac{π}{3})$ $=\cos(\pi+\pi/3)$

$= - cos (\frac{π}{3})$ $=-\cos(\pi/3)$

$= - \frac{1}{2}$ $=-1/2$

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