E
Editor
Sep 18, 2022
$\cos^{-1}(\cos\frac{4\pi}{3})$=
Difficulty: Easy
A:
$\frac{\pi}{2}$
B:
$\frac{\pi}{3}$
C:
$\frac{2\pi}{3}$
D:
$\frac{-\pi}{3}$
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ID: 63273db9ca83163ac3a1152f