$\frac{x-3}{x^2-x}$
$z-9<1$
$\frac{\left(x^2-1\right)}{x^2-16}$
$sin\left(6x\right)cos\left(6x\right)$
$\left(\frac{3^{-4}\cdot3^{10}}{3^5}\right)$
$3x^5+18x^3+27x$
$45.\:56$
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