$2\sqrt{9\cdot3}-5\sqrt{4\cdot3}+4\sqrt{3}$
$y^{'\:}=\frac{x^4+3x^2y^2+y^4}{x^3y}$
$\left(2x^2+y^3\right).\left(2x^2+y^3\right)$
$\frac{r^2s^{-3}}{3s^2}\cdot\frac{s^2}{r^{-4}}$
$\frac{x}{7}+5=1$
$9m+12$
$\frac{d}{dx}\sqrt[9]{x}-9e^x$
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