$-12a\left(m-n+1\right)+\:\left(-m+n-1\right)\:+m\:\left(6m-6n+6\right)$
$_{\:\frac{2x-1}{x-1}whn\:\:x\to1}$
$\int\frac{x-3}{\left(x^2-6x+34\right)}dx$
$\frac{2x^2-4x+1}{2x^3-x^2-2x+1}$
$-4x-y+5-2x-6$
$2cos^2+cosb=0$
$\frac{n^3}{3n}\left(x+1\right)^n$
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