bachkhoa

$\large \int_{0}^{1}\frac{x^3}{\sqrt{1-x^2}}dx$

$\large \int_{0}^{\propto }\frac{xlnx}{(1+x^2)^2}dx$

$\large \int_{0}^{\propto }x^3e^{-x^2}dx$

I=$\large \int_{0}^{\propto }\frac{arctanx}{(1+x^2)^{\frac{3}{2}}}dx$

$\large \int_{0}^{1}\frac{x^2}{(1+x^2)\sqrt{1-x}}dx$