$2\cos\left(3x\right)=0$
$\left(6x-6\right)+\left(-4x+1\right)$
$\left(-5+2\right)\:-\:\left(6-7\right)$
$\int\frac{1}{3\sqrt{x}+2}dx$
$\:9a^2-12xy-9y^2$
$\frac{x^3+8}{x^3+2}$
$2m-4n+8n-5m$
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