$20:\left(15-5\right)-\left(3-\left(2+7-1\right)+3\right)$
$\frac{d^2}{dx^2}\left(3x^3-x^2+6x-4\right)$
$\lim_{x\to-\infty}\frac{e^x+e^{-x}}{e^x-e^{-x}}$
$y^2-x^2=9$
$\left(\:-\:8:\:2\:-\:4:\:2\:\right)$
$a^5\:a^{-3}$
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