$\int z\sqrt{z-3}dx$

$a^3-a^2\:\:7a^2b+9ab^2$

$\left(5xy-z\right)\left(5xy-2\right)$

$\left(a+x\right)^2-2\left(a+x\right)\left(x+y\right)+\left(x+y^2\right)$

$\frac{d}{dx}\left(\frac{x^4\left(x-4\right)^3}{\left(x+1\right)^2}\right)$

$\lim_{x\to3.99}\left(\frac{\sqrt{16+x^2-8x}\left(2x-8\right)}{\left(x-4\right)^3}\right)$

$16\left(16\right)$