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Editor
 Sep 18, 2022
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$\cos^{-1}(\cos\frac{4\pi}{3})$=
Difficulty: Easy
A: 
$\frac{\pi}{2}$
B: 
$\frac{\pi}{3}$
C: 
$\frac{2\pi}{3}$
D: 
$\frac{-\pi}{3}$
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NETNUST Entry TestMathematicsInverse Trigonometric Functions