$\left(-2x^3y^4+32x^2y^3-18xy^4+4xy\right)\left(-2xy^2\right)$

$\left(-x^2+6x-8\right)^2$

$\lim_{x\to\infty}\left(\frac{4x^2+3}{x^2-5x-1}\right)$

$\int_0^{\:1}\:x^2e^xdx$

$\int\left(\frac{x^2-4}{x^3+5x^2+6x}\right)dx$

$\frac{dy}{dx}=x^2y^3+xy^3$

$\int\frac{4x^2+9}{x^2}dx$