$\left(9m+9\right)\left(9m-9\right)$
$\frac{dy}{dx}=\frac{1}{50}\left(100-3y\right)y$
$x+2>6$
$\int\frac{3x^2+6x+7}{\left(x^3-9x\right)}dx$
$b^3+9b^2+27b+27$
$cos3x-cosx$
$\:\frac{1}{2-x}+\frac{-12}{8-x^3}\:$
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