$\int x\cdot\cos\left(3x+1\right)^2dx$
$x^3-18x^2+81x$
$3^2x-2x+1$
$\frac{c}{d}\:-\:\frac{a}{b}$
$\frac{a^{-3}}{a^{-4}}$
$\lim_{x\to9}\left(\frac{4x-36}{\sqrt{x}-3}\right)$
$4x-8\le2x+1$
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