$\frac{x^2-9x}{x^2+4x}$
$\left(z+6\right)\left(z+5\right)$
$\left(x\:+\:4\right)\:\left(y\:+\:2\right)\:\left(x\:+\:3\right)$
$\frac{d}{dx}xlnsinx$
$\frac{d}{dx}\:y^2-4x^5+6xy-6x=6$
$\left(m-9\right)\left(m+4\right)$
$x^2+20x+0$
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