$r^2-20r+2$
$\frac{h^2+2xh}{h}$
$\frac{d}{dx}\left(artan\left(3x\right)\right)$
$\frac{dy}{dx}\left(y=x^4\:sin\:x\:cos\:x\right)$
$( \frac { 4 } { 3 } m ^ { 2 } y ^ { 3 } + \frac { 7 } { 3 } x ^ { 2 } m n )$
$\frac{x^{-2}}{x^3}$
$\frac{2x^6+x^3+16x^2}{2x^2}$
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