E
Editor
Sep 18, 2022
What is the value of $\cos^{-1}(\frac{-1}{2})$=
Difficulty: Easy
A:
$\frac{2\pi}{3}$
B:
$\frac{\pi}{4}$
C:
$\frac{3\pi}{2}$
D:
$\frac{\pi}{6}$
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