$\frac{dy}{dx}=\frac{2xy}{x^2-3y^2}$
$\sqrt[12]{x^3}y^7$
$\lim_{x\to+\infty}\frac{2x^2+3x-1}{x^2+x+2}$
$\frac{d}{dx}5\sqrt{x^2+7}$
$4x\:+7\:y\:-\:42\:=\:0\:$
$7u+8u$
$x^2+10x+35=0$
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