$\frac{-9+3x}{9-x^4}$
$\frac{-x^3+8}{2x^2}$
$\left(2xy^2-3y\right)^2$
$\left(\frac{1}{4x}+2\right)^2$
$\frac{d^2}{dx^2}\left(\frac{x+2}{x^2-2}\right)$
$m\sqrt{2}x\:m\sqrt{2}+m\sqrt{2}$
$x^2-2x-15=22$
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