$\lim_{x\to0}\left(\frac{9\left(e^x\:-\:1\:-x\right)}{x^3}\right)$
$81:3$
$\frac{x^3-4x+1}{x\:-\:3}$
$b^2-2b-48$
$\frac{dy}{dx}=\cos^2\left(2x\right)\cos^2\left(2y\right)$
$5x-7\le-13$
$0.25\cdot2$
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