$n+0.9n+0.5n$
$\left(\frac{x+1}{2x-2}\right)\left(\frac{x-1}{2x+2}\right)$
$a^2-4a-21$
$\frac{d^9}{dx^9}\left(\cos\left(3x\right)\right)$
$y=\:sen^2\left(7x^2-9x+2\right)$
$4x^2+10x-24$
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