$9x^2+6x+9$
$\sqrt{\left(3-3\right)}^2+\left(-1-3\right)^2$
$\left(6x+9x\right)^2$
$\lim_{x\to1}\left(\frac{\left(x+2\right)^2}{x-1}\right)$
$\left(5x^2y^3-6y^4\right)^2$
$-1\:+\:5\:+\:-1$
$p^2+2p_{+1}$
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