$\sqrt{81}+3-\left(-2\right)\left(4\right)$
$\int\frac{1}{\left(n-n^2\right)}dn$
$x^2+12x+1$
$\left(1+3b^2x^2\right)\left(1-3b^2x^2\right)$
$\int\frac{x^2+2x}{\sqrt{x+1}}dx$
$\frac{3x^24x+3}{3x+2}$
$1\left|\left(1+x^2\right)-1\right|$
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