$\frac{x^2-2x}{\left(x-1\right)^2}$
$3 x ^ { 3 } - 6 x$
$-3a^{x-2}-r^{x-2}$
$+4+15+23$
$\frac{d}{dx}x^{-\pi^{13}}$
$\left(3m^2-4n+5v^3\right)^2$
$2\left(-d\right)\left(\frac{6}{5}q^2\right)$
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