$12x^2-13-35$
$\int_{8\:}^{+\infty\:}\left(\frac{90}{x+2}\right)dx$
$9x^2+12x+x$
$\sqrt[3]{at}$
$-2a^2-4a$
$\frac{dp}{dt}=pt$
$\lim_{x\to0}\left(\frac{7x^2+7y^2-x^2y^2}{x^2+\:y^2}\right)$
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