indefinite-integration

Question: $\int_{{}}^{{}}{\frac{x}{1+{{x}^{4}}}\ dx=}$

1) $\frac{1}{2}{{\cot }^{-1}}{{x}^{2}}+c$

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

3) ${{\cot }^{-1}}{{x}^{2}}+c$

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

Solution:

Explanation: No Explanation

Integration by substitution

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