$\:8\:-\:2\:+\:7\:+\:1\:$
$\frac{d}{dx}\left(\frac{2x-3y}{z-2y}+xz^2\right)$
$a^2-7a+9$
$2x+7\le3\left(4x-1\right)$
$\frac{dy}{dx}=-\frac{9x}{y}$
$\lim_{x\to\infty}\left(\frac{\sqrt{x^5+1}}{x^2+1}\right)$
$\frac{109.7}{20}$
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