$-4\:-\:90\:-\:5$
$\sqrt[6]{\sqrt[3]{x^2}}$
$\lim_{x\to2}\left(\frac{x-3}{x^2-4}\right)$
$\log2\left(\frac{1}{4}\right)$
$\csc x-\frac{5}{2}=0$
$\frac{3a^2}{3\left(a^2\right)^4}$
$1-\left(-3+6+1\right)-\left[6-3+1\right]$
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