$\sqrt{36}-\left\{3^2\right\}\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:3^2+\left[-3+5\left(13-6\right)\right]$
$\left(2x+5\right)\left(x-8\right)$
$\frac{1}{4}x^2+3x-2\cdot6x^2-1$
$\int\:\:x^2\:3^{3x}dx$
$xy^2\frac{dy}{dx}=y^3-x^3-x^2y$
$\lim_{x\to1}\left(\frac{x^2-1}{x^2+1}\right)$
$\lim_{t\to0}\left(\frac{sen^2\left(2t\right)}{t^2}\right)$
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