The sum of the infinite series \[{{\cot }^{-1}}2+{{\cot }^{-1}}8+{{\cot }^{-1}}18+{{\cot }^{-1}}32+...\] is,

The sum of the infinite series \[{{\cot }^{-1}}2+{{\cot }^{-1}}8+{{\co

1.	The sum of the infinite series \[{{\cot }^{-1}}2+{{\cot }^{-1}}8+{{\cot }^{-1}}18+{{\cot }^{-1}}32+...\] is,
A.	\[\pi \]
B.	\[\frac{\pi }{2}\]
C.	\[\frac{\pi }{4}\]
D.	None of these
Answer» D. None of these

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The sum of the infinite series \[{{\cot }^{-1}}2+{{\cot }^{-1}}8+{{\cot }^{-1}}18+{{\cot }^{-1}}32+...\] is,

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