$\int x\:\cos\frac{x}{6}\:dx$
$4\left(2\right)x^2-81$
$\frac{3x-2}{x^2+5}+\frac{2x+3}{x^2+5}$
$3x^2+3x-6\le0$
$25x^2+90x+81$
$\lim_{x\to3}\left(\frac{2x^2-x-3}{x-3}\right)$
$26xy\left(-24y\right)$
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