$z^2-4z+16$
$013\infty$
$\frac{2x^2.}{x^2+9}$
$12x-4\:3x+1$
$\left(a\:+\:4\right)\left(a\:+\:9\right)\:-\:\left(a\:+\:6\right)^2$
$\frac{d}{dx}\left(\ln\left(\frac{x^5\left(x-8\right)^2}{\left(x^2+5\right)^7}\right)\right)$
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