$y+13=20$
$\lim_{x\to0}\left(\frac{4x^2-4}{\sqrt{x+3}-2}\right)$
$6-x^2-18x+5y^2+13xy-23y+7$
$\frac{dy}{dx}=\frac{x^2-3}{3y^2}$
$dy\sqrt{x}=\sqrt{x}+1$
$7 x - 10 x ^ { 2 } + 15 x ^ { 2 }$
$\frac{dy}{dx}=\frac{x}{y^2},\:y\left(0\right)=1$
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