$\left(9-4\right)-\left(6-2\right)+\left(12-4\right)\cdot\left(7-9\right)$
$tan^2x\:+\:tanx\:-20=0$
$b^3-1$
$\lim_{x\to0}\left(\frac{xe^x}{e^x}\right)$
$\frac{x^2+3x+2}{-3x^2+19x-6}$
$x^3-1x^2-12x$
$\int_0^y\left(\frac{1}{x^2+30}\right)dx$
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