$\left(x-1\right)\left(x\:+\:1\right)-3x\left(x^2\:-\:2x-\:1\right)$
$13+\frac{x}{4}$
$4x\:+\:8\:>\:5x\:+9$
$\left(\frac{2}{3}xy+\frac{1}{2}a^2b^3\right)^3$
$\int\left(3x\left(9-x^{-9}\right)\right)dx$
$\lim_{x\to1}\left(2\sin^2x\right)$
$-\left(x+4\right)^2$
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