$x^2-155x+2800$
$x+4^2+1$
$\lim_{x\to\infty}\left(\sqrt{x^2\:+\:11}\right)$
$2y''+2y'+3y=0$
$x^2-11x-34$
$\left(3x-6\right)\left(x+6\right)$
$2+4cd-3c-6d$
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