$\left(n^2-6\right)\left(n+3\right)$
$\int\left(\frac{2}{1+\sqrt{x}}\right)dx$
$\left(2\cdot6\right)^2$
$\int_{-1}^3-4xdx$
$\lim_{x\to4}\left(\frac{x^2+17x+20}{x^2-x-20}\right)$
$-7^2$
$\frac{4x^2-8x+3}{36x^3+66x^2+40}$
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