$\frac{dy}{dx}=\frac{y}{x}+\frac{x^2}{y^2}$
$\frac{x^2}{x^4\:+\:81}$
$2x^2-15x+25\:\:x-5$
$y=\left(x+1\right)^2\left(x-1\right)\left(x-3\right)$
$12x^2+24xy+72x-12=0$
$\frac{d}{dx}kx^{-1}$
$4x^2\:+\:8x^2+\:3\:$
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