$\frac{2x^3+x^2+3}{x-3}$

$004x^2+012xy+009y^2$

$4xy\:dx\:+\:\left(x^2+1\right)dy=0$

$\left(\frac{4}{5}x^3y^2-\frac{1}{3}xy\right)\left(\frac{4}{5}x^3y^2+\frac{1}{3}xy\right)$

$+z-2z+3z+z$

$\int_{\infty}^0x^3e^xdx$

$\left(15x^2y-7xy^2+13y^3\right)-\left(5x^2y-14xy^2+26y^3\right)$