indefinite-integration

Question: $\int{\frac{dx}{{{a}^{2}}-{{x}^{2}}}}$ is equal to



1) $\frac{1}{a}{{\tan }^{-1}}\left( \frac{x}{a} \right)$
2) $\frac{1}{2a}{{\sin }^{-1}}\left( \frac{a-x}{a+x} \right)$
3) $\frac{1}{2a}\log \,\left( \frac{a+x}{a-x} \right)$
4) $\frac{1}{2a}\log \,\left( \frac{a-x}{a+x} \right)$
Solution: Explanation: No Explanation
Fundamental integration

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