$\frac{7^8}{7^2}$
$-x^2-12x+9$
$\lim_{x\to5.001}\left(x+9\right)$
$4-x^2>0$
$\frac{dy}{dx}=\frac{y}{2x-3y}$
$-\frac{-11}{11}$
$x^2-3x+20$
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