$\lim_{x\to0}\left(x+1\right)^3$
$\left(\sin\left(x\right)+\sec\left(x\right)\right)\left(\sin\left(x\right)-\sec\left(x\right)\right)$
$n2\:+\:2n$
$\frac{d}{dx}x+\frac{9}{x}$
$\frac{x^2}{4}\cdot x$
$\sqrt{\frac{m}{\frac{m}{s^2}}}$
$2x^2-\frac{9x}{2}-9$
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