$4n^2-4n+1$
$2x^2y^2-2x^3z+2x^2y^3$
$\left(6-z^2\right)\left(z^3-5z+2\right)$
$-x^2=-1$
$\frac{\left(x^3-125\right)}{x^2+5\:x\:+25}$
$\left(3x+2\right)\left(2y+5\right)$
$600\:.\:-8$
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