indefinite-integration

Question: $\int{\frac{dx}{{{({{a}^{2}}+{{x}^{2}})}^{3/2}}}}$ is equal to

1) $\frac{x}{{{\left( {{a}^{2}}+{{x}^{2}} \right)}^{1/2}}}$

2) $\frac{x}{{{a}^{2}}{{\left( {{a}^{2}}+{{x}^{2}} \right)}^{1/2}}}$

3) $\frac{1}{{{a}^{2}}{{\left( {{a}^{2}}+{{x}^{2}} \right)}^{1/2}}}$

4) None of these

Solution:

Explanation: No Explanation

Integration by substitution

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