$\frac{10x}{\left[1+9e^y\right]}$

$\frac{x}{\left[1+9e^y\right]}$

$\frac{4x}{\left[1+5e^y\right]}$

$\frac{-x}{2y}$

$\frac{x}{y}$

$\frac{-x}{y}$

$\frac{2x+y}{\left[1-x-y\right]}$

$\frac{14x}{\left[1-6y\right]}$

$\frac{2x+y}{\left[1-x-6y\right]}$

$\frac{-x^2}{y^2}$

$\frac{x}{y}$

$\frac{-x}{y}$

$2x+2$

$\frac{x}{\left[1+9e^y\right]}$

$6x+1$

$\frac{-3x^2}{2y}$

$\frac{3x^2}{2y}$

$\frac{-2x^3}{y}$

$x^2$

$\frac{x}{\left[1+9e^y\right]}$

$2x$

$4x$

$\frac{x}{\left[1+9e^y\right]}$

$2x^3$

$\frac{1}{\sqrt{1+9x^2}}$

$\frac{6x}{y}$

$\frac{1}{\sqrt{1-9x^2}}$

$\frac{-3x^2}{\left[2y\right]}$

$\frac{x^3-xy}{\left[x^2-3y^2\right]}$

$\frac{x^3-6xy}{\left[x^2-3y^2\right]}$