$2x^3+3xy+4x^2+6y$
$2z^2\:+\:3z^4$
$\frac{14x^2+7x}{7}$
$100-n^2$
$m^2+2+1$
$\frac{dy}{dx}=y-\frac{1}{y}$
$\frac{x-2}{x\left(x-2\right)}$
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