$4x^2+9^2+30x-25$
$\frac{3s-7}{\left(s-1\right)\left(s-3\right)}$
$\frac{d^2}{dx^2}xe^x$
$\frac{x-2\:}{x^2-4}$
$\frac{a^2}{2a}$
$\left(4x-3y^2\right)^2$
$16x+14x+x$
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