$-42-1+102^2-3-1^2+5$
$8y^3-z^3$
$\frac{5+\sqrt{-49}}{6}$
$a^2-a+1$
$9i^2\:49i^6$
$\lim_{x\to0}\left(\frac{w^3-64w}{w^2+2w}\right)$
$\lim_{x\to0}\left(\frac{3xy}{x^2+y^2}\right)$
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