$-x^3+2x^2+9x-18$
$3+\frac{2}{x}$
$\frac{dy}{dx}=x^y$
$-\left(-4\right)-7-\left(12\right)-1-1$
$y=\frac{1}{x}+\frac{1}{x^2}$
$4x^2+12x-9$
$\lim_{x\to3}\left(2x^2+1\right)$
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