$\frac{dy}{dx}=\frac{e^{x-y}}{1+e^x}$
$2c^3+3c^2-2c-3$
$\left(2d+4e\right)^2$
$27m^3+64n^9$
$\sqrt[28]{\sqrt[4]{\left(-2\right)}}$
$x^2\le9$
$\left(3x+2\right)\left(3x-b\right)$
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