Integral of $$$12 i n t x^{3} \sqrt{x^{2} + 1}$$$ with respect to $$$x$$$

The calculator will find the integral/antiderivative of $$$12 i n t x^{3} \sqrt{x^{2} + 1}$$$ with respect to $$$x$$$, with steps shown.

Find $$$\int 12 i n t x^{3} \sqrt{x^{2} + 1}\, dx$$$.

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