$\left(p+2\right)\left(p-2\right)$
$1+\left(-13\right)-12$
$\frac{2x^2-x+1}{\left(x-1\right)^2}$
$\lim_{u\to-\pi}\frac{9cosx+9}{\left(x+\pi\right)^2}$
$-6\left(9\right)$
$\left(3x-5\right)\left(3x+5\right)\left(9x^2-9x-10\right)$
$5h+11g+1h-8g$
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