$17ab\:-\:8ab$
$\left(2x^2-2y^2\right)^2$
$\frac{d^2}{dx^2}\left(xy^2\right)$
$\left(5x+3\right)\left(2x-3\right)$
$4sen2\left(x\right)=1$
$\left(\sqrt{4x^2}\right)\left(\sqrt{3}\right)$
$\frac{d}{dx}2e^{x^2}\cdot x+\frac{2}{x}$
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