How do you find the exact values of ${cos}^{- 1} (\frac{1}{2})$ $cos^-1 (1/2)$ ?

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Answer 1 · 2016-08-19T03:39:11

$\pm \frac{π}{3}$ $+- pi/3$

Trig table and unit circle -->
$cos x = \frac{1}{2}$ $cos x = 1/2$ --> arc $x = = \pm \frac{π}{3}$ $x = = +- pi/3$

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