\[{{\tan }^{-1}}1+{{\tan }^{-1}}2+{{\tan }^{-1}}3=\] – McqOptions

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1.	\[{{\tan }^{-1}}1+{{\tan }^{-1}}2+{{\tan }^{-1}}3=\]
A.	\[\frac{\pi }{2}\]
B.	\[\frac{\pi }{4}\]
C.	0
D.	None of these
Answer» E.

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