$\frac{4x^3-36x^2+108x-108}{x-2}$
$\int\left(x^3\sqrt{2x^4-1}\right)dx$
$\frac{8+x^2}{2+x}$
$\int\sqrt{x}\left(4x-3\right)dx$
$\int x\cdot\cos\left(x\right)e^{-x}dx$
$n^2-144$
$5x^6y+15x^2y^3-30x^3y^2$
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