indefinite-integration

Question: A primitive of $\frac{x}{{{x}^{2}}+1}$ is

1) ${{\log }_{e}}({{x}^{2}}+1)$

2) $x{{\tan }^{-1}}x$

3) $\frac{{{\log }_{e}}({{x}^{2}}+1)}{2}$

4) $\frac{1}{2}x{{\tan }^{-1}}x$

Solution:

Explanation: No Explanation

Integration by substitution

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