$$\displaystyle\int{ \frac{ { x }^{ 3 } }{ \sqrt{ 4- { x }^{ 2 } } } }d x$$
$\frac{2\cos(3\arcsin(\frac{x}{2}))}{3}-3\sqrt{4-x^{2}}+С$
$\frac{-2\sin(3\arcsin(\frac{x}{2}))+3x}{\sqrt{4-x^{2}}}$
