indefinite-integration

Question: $\int_{{}}^{{}}{\frac{\log (x+\sqrt{1+{{x}^{2}}})}{\sqrt{1+{{x}^{2}}}}\ dx=}$



1) $\frac{1}{2}{{[\log (x+\sqrt{1+{{x}^{2}}})]}^{2}}+c$
2) $\log {{(x+\sqrt{1+{{x}^{2}}})}^{2}}+c$
3) $\log (x+\sqrt{1+{{x}^{2}}})+c$
4) None of these
Solution: Explanation: No Explanation
Integration by substitution

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