Editor
Editor
 Sep 18, 2022
0
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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NETNUST Entry TestMathematicsInverse Trigonometric Functions