$\frac{z^2-18z}{z}$
$a^2b+ab^3$
$\left|5\right|-\left|7-4\right|$
$\frac{d}{dx}cosx=e^y$
$\int\frac{x+1}{\sqrt[2]{x^2-9}}dx$
$\left(2y^2-3\right)^2$
$2z^2-7z-4=0$
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