$\frac{d^4y}{dx^4}\:y=x\:inx$
$x^2+20x+100=0$
$\sqrt[3]{512x^3}$
$-4c\:-\:2c$
$\frac{dy}{dx}=\frac{3^x+\pi}{y^2}$
$x^2\frac{dy}{dx}-2y=3y^{-4}$
$x+y=37$
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