\[4{{\tan }^{-1}}\frac{1}{5}-{{\tan }^{-1}}\frac{1}{70}+{{\tan }^{-1}}\frac{1}{99}=\] [Roorkee 1981]

\[4{{\tan }^{-1}}\frac{1}{5}-{{\tan }^{-1}}\frac{1}{70}+{{\tan }^{-1}}

1.	\[4{{\tan }^{-1}}\frac{1}{5}-{{\tan }^{-1}}\frac{1}{70}+{{\tan }^{-1}}\frac{1}{99}=\] [Roorkee 1981]
A.	\[\frac{\pi }{2}\]
B.	\[\frac{\pi }{3}\]
C.	\[\frac{\pi }{4}\]
D.	None of these
Answer» D. None of these

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\[4{{\tan }^{-1}}\frac{1}{5}-{{\tan }^{-1}}\frac{1}{70}+{{\tan }^{-1}}\frac{1}{99}=\] [Roorkee 1981]

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