$\frac{d}{dx}\left(\frac{x^2}{4}+\frac{y^2}{9}=1\right)$

$\frac{d}{dx}\left(x^2-y^2=25\right)$

$\frac{d}{dx}\left(xy+2x+3x^2=4\right)$

$\frac{d}{dx}\left(x^{\frac{2}{3}}+y^{\frac{2}{3}}=5\right)$

$\frac{d}{dx}\left(x^2+y^2=16\right)$

$\frac{d}{dx}\left(x^3-3x^2y+2xy^2=12\right)$

$\frac{d}{dx}\left(y^2\:-\:2y=x\right)$

$\frac{d}{dx}\left(x^2+xy-y^2=4\right)$