A) \[-\frac{\pi }{6}\]
B) \[\frac{5\pi }{6}\]
C) \[\frac{\pi }{3}\]
D) \[\frac{2\pi }{3}\]
Correct Answer: B
Solution :
\[{{\cot }^{-1}}(-\sqrt{3})\,=\pi -{{\cot }^{-1}}(\sqrt{3})=\frac{5\,\pi }{6}\].
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