$\left(u+2\right)\left(u-7\right)$
$4q-5q-4q$
$x^5-6x^3+9x$
$\int\frac{\sqrt{x^2-4\:}}{x^2}dx$
$x^2+2x-80$
$\frac{x^2+2x+x^2-2}{x^2+1}$
$\lim_{x\to0}\left(\sqrt{1+\frac{2}{x}}-\sqrt{1+\frac{3}{x}}\right)$
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