\[{{\cos }^{-1}}\left( \cos \frac{7\pi }{6} \right)=\]

1.	\[{{\cos }^{-1}}\left( \cos \frac{7\pi }{6} \right)=\]
A.	\[\frac{7\pi }{6}\]
B.	\[\frac{5\pi }{6}\]
C.	\[\frac{\pi }{6}\]
D.	None of these
Answer» C. \[\frac{\pi }{6}\]

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\[{{\cos }^{-1}}\left( \cos \frac{7\pi }{6} \right)=\]

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