$2x^2-4x+6$
$\left(2x\right)\left(2x-y\right)$
$\frac{dy}{dx}+4x^3y=x^3$
$6x^2+7x+2=0$
$45m^4-20n^4$
$\frac{d}{dx}\left(\sqrt{\frac{x-3}{x^8+1}}\right)$
$\left(a-0.2\right)\left(a-0.3\right)$
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