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$49x^4-14x^2y+y^2$
$\lim_{x\to0}\left(\frac{e^x-x-cos\left(x\right)}{[sen\left(x\right)]^2}\right)$
$\frac{x}{7}=-5$
$-18\:-\:\frac{7}{-1}$
$4x^2-24x+35=0$
$2ab-3ab+4ac$
$\int\frac{1-2x-x^2}{x^3-x}dx$
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