$\sqrt{-56}$
$1-5-6$
$\tan^{-1}\left(\frac{5}{12}\right)+\tan^{-1}\left(\frac{7}{14}\right)$
$nbny$
$\sqrt[3]{x^{y^6}}$
$24+3^27^32$
$-\left(\frac{1}{2}\right)^{-2}$
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