$\lim_{x\to4}\left(\frac{x^2-164}{x^2+2x-24}\right)$

$\int x^2\:cos\left(x^3+1\right)dx$

$\lim_{x\to\infty}\frac{-3x^2+14x-1}{x^2+79}$

$\left(3mn-2x\right)\left(3mn+zy\right)$

$\int_0^{\infty}\left(\frac{e^{-2t}-e^{-4t}}{t}\right)dt$

$\left(a+1\right)\left(a^n+a^{n+1}+a^{n+2}\right)$

$\left(xy-6z^2\right)^2$