E
Editor
Sep 18, 2022
The exact value of $\cos^{-1}(-1)+\cos^{-1}(1)$=
Difficulty: Easy
A:
$\pi$
B:
$-\pi$
C:
$\frac{\pi}{2}$
D:
$\frac{\pi}{3}$
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ID: 63273db9ca83163ac3a115b3