$9x^2-6x-1$
$\left[\left(a+2\right)\:-\:b\right]\:\left[\left(a+2\right)\:+\:b\right]$
$\lim_{x\to2}\left(\frac{x^2-2x-8}{3x-6}\right)$
$\:3\:-\:\left(\:5\:+\:1\:\right)\:-\:2\:-\:\left(\:6+\:3\:\right)\:-\:2\:-\:\left(\:6\:-\:1\:\right)$
$12x^2-48=0$
$y+3x^2y=10x^2$
$\left(\sqrt{x}+1\right)\left(\sqrt{x}+2\right)$
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