$\frac{x^2}{9}-9$
$m\left(x-1\right)-2n\left(x-1\right)$
$\cos\left(x\right)-1=\frac{\cos\left(2x\right)-1}{2\cos\left(x\right)+2}$
$x^2+xy^3$
$\int\frac{-2x+3}{81\left(x^2-3x+9\right)}dx$
$8u+7-6u-5$
$\sqrt[6]{\left(2x\right)}5$
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