$y=9x^{-x}$
$\frac{dy}{dx}=1-e^{-x}$
$\frac{dy}{dx}=y-x-1$
$\frac{x^2+5x+2}{x}$
$\sqrt{9^2+-1^2}$
$\frac{6x^2-20}{x-1}$
$\left(\frac{sin\left(x+y\right)}{sin\left(x\right)sin\left(y\right)}\right)$
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