A) \[\frac{7\pi }{6}\]
B) \[\frac{5\pi }{6}\]
C) \[\frac{5\pi }{6}\]
D) \[\frac{13\pi }{6}\]
Correct Answer: C
Solution :
\[{{\cos }^{-1}}\left( \cos \frac{7\pi }{6} \right)={{\cos }^{-1}}\left( \cos \left( 2\pi -\frac{5\pi }{6} \right) \right)\] \[={{\cos }^{-1}}\left( \cos \left( \frac{5\pi }{6} \right) \right)=\frac{5\pi }{6}\]
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