$\frac{x^3-1}{x^1-1}$
$a^2-12a+36$
$3x^3+81$
$\frac{3x^2-3x}{2x^3-2x}$
$\left(x-\left(\frac{x^3}{6}\right)+g\right)\left(1-x+\frac{x^2}{2}-\frac{x^3}{6}+g\right)$
$\lim_{x\to\infty}\left(4\arctan\left(e^x\right)\right)$
$\frac{2}{6}-x^2-7x$
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