indefinite-integration

Question: $\int_{{}}^{{}}{\frac{dx}{1-{{x}^{2}}}=}$

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

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

3) $\frac{1}{2}\ln \left| \frac{1+x}{1-x} \right|+c$

4) $\frac{1}{2}\ln \left| \frac{1-x}{1+x} \right|+c$

Solution:

Explanation: No Explanation

Fundamental integration

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