$\int x^2\left(0.15e^{-0.15\left(x-0.5\right)}\right)dx$

$\int\frac{8}{\left(x^3-4x\right)}dx$

$\int x^3\sqrt{16-4x^2}dx$

$\int\left(\frac{x^3}{\left(x^4-1\right)^4}\right)dx$

$7x+4x^2-5x$

$\left(-5a-2b\right)^2$

$\frac{\left(4m^{-4}n^{-6}\right)}{\left(m^{-2}n-3\right)}$