indefinite-integration

Question: $\int_{{}}^{{}}{\sqrt{1+{{x}^{2}}}\ dx=}$

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

2) $\frac{2}{3}{{(1+{{x}^{2}})}^{3/2}}+c$

3) $\frac{2}{3}x{{(1+{{x}^{2}})}^{3/2}}+c$

4) None of these

Solution:

Explanation: No Explanation

Fundamental integration

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