$16+8-\left(20-9\right)+\left(9-5+3\right)$
$\frac{x^2+3}{x^2-1}$
$\frac{x^4}{x^8}$
$\frac{d}{dx}5x^3+3x-8$
$-5+\sqrt{-2}$
$\left(\frac{1}{\left(1-4\cdot e^{-x}\right)}\right)^2$
$\frac{a^3b^{-2}}{a^2b^3}$
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