$\cot\infty+\frac{1}{\cot\infty}$
$l\:-15\:-\:18\:-\:8\:l$
$\lim_{x\to a}\left(\frac{x^{x^a}-a^{a^x}}{x-a}\right)$
$5.\left(-4\right)-3.2$
$-19-90+-47+-18$
$9,\:692\:-\:-34,\:580\:=\:$
$\sqrt[8]{x^3}$
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