The value of \[{{\cot }^{-1}}7+{{\cot }^{-1}}8+{{\cot }^{-1}}18\] is

1.	The value of \[{{\cot }^{-1}}7+{{\cot }^{-1}}8+{{\cot }^{-1}}18\] is
A.	\[\pi \]
B.	\[\frac{\pi }{2}\]
C.	\[{{\cot }^{-1}}5\]
D.	\[{{\cot }^{-1}}3\]
Answer» E.

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The value of \[{{\cot }^{-1}}7+{{\cot }^{-1}}8+{{\cot }^{-1}}18\] is

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