indefinite-integration

Question: $\int_{{}}^{{}}{\frac{1}{x-{{x}^{3}}}\ dx=}$

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

2) $\log \frac{(1-x)}{x(1+x)}+c$

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

4) $\frac{1}{2}\log \frac{{{x}^{2}}}{(1-{{x}^{2}})}+c$

Solution:

Explanation: No Explanation

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