$\int_{-1}^1-12xdx$
$x^2\:-\:8x\:-\:240$
$\frac{d}{dx}\left(xy+1=x\sqrt{y+1}\right)$
$2^2-3x-9$
$5-3+1-2$
$\lim_{x\to1}\frac{sen\left(1-x\right)}{\sqrt{x-1}}$
$\lim_{x\to12}\left(\frac{x^2-ln\left(\frac{7}{x}\right)}{3x^2+8x}\right)$
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