$$\displaystyle\int{ { x }^{ 3 } \sqrt{ 1- { x }^{ 2 } } }d x$$
$\frac{\left(1-x^{2}\right)^{\frac{5}{2}}}{5}-\frac{\left(1-x^{2}\right)^{\frac{3}{2}}}{3}+С$
$\sqrt{1-x^{2}}x^{3}$
