Evaluate ∫01x31+x2dx\int_0^1 \frac{x^3}{\sqrt{1+x^2}} dx∫011+x2x3dx.
2−23\frac{2-\sqrt{2}}{3}32−2
2+23\frac{2+\sqrt{2}}{3}32+2
13\frac{1}{3}31
2−1\sqrt{2}-12−1