$\frac{-2x^2+16x-24}{-6x^2+32x-40}$
$cotx\left(csc^2x-1\right)$
$-2x-3x^2-5=-1$
$8n^2+12n$
$-\frac{1}{\left(x^2-3x+2\right)}$
$\:3xy2\:-\:\left(-\:9xy2\right)\:$
$\left(2xy\right)\left(x^2y^4\right)$
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