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$2x^2-x+4x^2-x$
$\lim_{x\to0\:}\frac{3x+2}{x-2}$
$\frac{dy}{dx}\left(7\sqrt{x}+\sqrt{y}=1\right)$
$\left(8^{-3}\right)^5$
$\frac{x^2y^3}{xy^2}$
$-9\left(z+8\right)=-9z-72$
$\left(1+sen3x\right)\:\left(1-sen3x\right)$
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