$\frac{\left(2x^3-5x^2+x\right)}{x}$
$4x-9\le19$
$3x+6<x+18$
$4-x>9$
$\frac{d}{dz}\ln\left(\sqrt{\frac{a^2-z^2}{a^2+z^2}}\right)$
$4x-5x+2$
$\int\left(t^3-4t^2+1\right)dt$
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