$4+\left(2\sqrt{3}+\sqrt{10}\right)\left(2\sqrt{3}-\sqrt{10}\right)$
$\int\cos\left(2x-3\right)dx$
$\left(8xd\right)^2$
$18-x>5$
$m^2-20m+4$
$\lim_{n\to\infty}\left(\frac{n+2}{n^2-4}\right)$
$-6x+2\ge8$
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