$\frac{dy}{dx}\left(tan\left(x-y\right)=\:2xy\right)$
$\int\frac{1}{\left(x+7\right)\left(x-9\right)}dx$
$x+4+2x-x-5-8x$
$4x-4=5x-8$
$125x^9+27y^6$
$8x^2-12x+1$
$f\left(x\right)=\frac{x}{\left(1+6x\right)^2}$
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