$\left(\frac{x^2y^{-1}+x^{-1}y^2}{x^{-1}+y^{-1}}\right)$
$\left(4^{-3}\right)^{-3}$
$\left(x-2\right)\left(x+5\right)<0$
$xy'+y=\left(xy\right)^3$
$\frac{72}{-24}$
$y=\frac{4x-12}{\left(x-2\right)^{2}}$
$3x^6-81$
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