$\frac{d^2}{dx^2}2000\left(xe^{-x}\right)$
$\frac{3-x^2}{4+x^2}$
$\sqrt{\frac{x^6}{25}}$
$8-x^9y^6$
$5x-3y=18$
$\left(7x^3+5y^4\right)^2$
$\left(\frac{21}{1}z\right)-\left(\frac{3}{5}z\right)$
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