$x^{-3}-y^{-3}$
$3^{x^2-x}=729$
$\lim_{y\to0}\left(\frac{sen\:10x}{\frac{cos\:10x}{x}}\right)$
$x\left(x+7\right)\left(x-2\right)$
$\int\left(e^{-x}\sec^2\left(e^{-x}\right)\right)dx$
$3-3cosx-sin^2x$
$e\left(-y+3z\right)$
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