$x\sqrt{x}^2+2$
$\left(\sec^2u-1\right)\sec u\tan u$
$-5x^2+15x+20$
$x^{18\:}-y^{18}$
$\left(2b-t^{x+2}\right)^2$
$x^2-8x+8=0$
$\left(4v+7y\right)\left(v-2y-5\right)$
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