$\frac{dy}{dx}=\frac{y^2}{x^4}$
$\frac{dy}{dx}-\frac{2y}{x}=4-x^2e^{-3x}$
$xy'-y=4x^2y$
$4ax=y^2$
$2\:+\:5\:+\:9\:+\:8\:+1\:$
$6x-36x^2\cdot\sqrt{6x}-2\sqrt{x}$
$\lim_{x\to1}\left(\frac{4^x-4}{x^2-1}\right)$
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