$\:\left(-7\right)-4+\left(-2\right)-\left(-12\right)+6$
$\lim_{x\to7}\frac{\sqrt{x^2+9}-3}{x^2}$
$\sqrt[3]{x^4}+x+2$
$\frac{3\pi}{2}-\frac{\pi}{4}$
$\sqrt{2x^3}-3x^2+2$
$\frac{d}{dx}\left(\:y^3-2xy^2=x^3y+5x^2y^2-1\right)$
$20e^{-2x}dy=x\left(y^2-6\right)dx$
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