$27a^3\:+\:1\:=\:\left(3a\:+\:1\right)\left(9a^2\:-\:3a\:+\:1\right)$
$\frac{n^3}{3n}\left(x+1\right)^n$
$\left|\frac{3}{2}+\frac{4}{5}\right|$
$5-\left(1+5\right)$
$\frac{x^4-\:y^4}{x-y}$
$\left(4\right)-\left(-4\right)\ge8$
$\lim_{x\to0}\left(\frac{e^x-x}{2e^x-x^2-2}\right)$
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