$\lim_{x\to\infty}\left(\frac{x+a}{x+b}\right)^x$
$m^2+6^2+49$
$9f+10f+12f$
$w^2-9w+20$
$=\frac{x^{2}-3}{x^{2}+2}$
$4x-3\sqrt{2}\ge0$
$\frac{221}{\left(-13\right)}$
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