$\frac{16}{4}$
$\frac{1}{x^4+6x^3+9x^2}$
$-15c\:-\:12d\:+\:11c\:-\:13d$
$\lim_{x\to0}\left(\frac{\sqrt{x+3}-2}{x^2-1}\right)$
$\frac{1}{\:2}a^3-\frac{2}{5}a^2x+\frac{3}{4}ax^2-\frac{1}{3}x^3\cdot\:\frac{1}{2}a-\frac{2}{5}x$
$\left(10ab+2\right)^2$
$\left(m+2x^3\right)^3$
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