definite-integral

Question: The value of $\int_{\,-\,1}^{\,3}{\,{{\tan }^{-1}}\left( \frac{x}{{{x}^{2}}+1} \right)+{{\tan }^{-1}}\left( \frac{{{x}^{2}}+1}{x} \right)\,dx}$ is



1) $2\pi $
2) $\pi $
3) $\frac{21}{5}\pi $
4) $\frac{\pi }{4}$
Solution: Explanation: No Explanation
Fundamental definite integration Definite integration by substitution

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