$\lim_{x\to0}\left(\frac{4e^x-4}{\sin\left(x\right)}\right)$

$\frac{\left(k\right)\left(k+1\right)\left(k+2\right)\left(k+3\right)}{4}+\left(k+1\right)\left(k+2\right)\left(k+3\right)$

$\frac{3x^{\:6}-15x^2+8x^5-2x+5}{x+2}$

$\int\left(z^2e^{-z}\right)dz$

$-500q+60q^2$

$\left(5xy\:+\:4\right)\:\left(\:25x^2y^2\:-\:20xy\:+\:16\right)$

$\frac{-18m^5n^2}{6m^2n}$