indefinite-integration

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

1) $\frac{1}{4}\log \left[ \frac{{{x}^{2}}-1}{{{x}^{2}}+1} \right]+c$

2) $\frac{1}{4}\log \left[ \frac{{{x}^{2}}+1}{{{x}^{2}}-1} \right]+c$

3) $\frac{1}{2}\log \left[ \frac{{{x}^{2}}-1}{{{x}^{2}}+1} \right]+c$

4) $\frac{1}{2}\log \left[ \frac{{{x}^{2}}+1}{{{x}^{2}}-1} \right]+c$

Solution:

Explanation: No Explanation

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