$\left(n^2-2m\right)^3$
$\frac{x^{-1}+y^{-1}}{z^{-1}}$
$\lim_{x\to0}\left(\frac{4-4cosx}{sin6x}\right)$
$+20\:+30\:+50\:-10$
$x-2x=4$
$y-\sqrt{x^2}-5$
$\frac{dy}{dx}\left(ax^3-y^2\right)\:$
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