$\lim_{x\to1}\left(\frac{2x-1}{x-1}\right)$
$4x^2-x=0$
$-14\cdot\left(-3\right)\cdot5$
$-6f-8f+-2f+-9f$
$\sqrt{x^2-2x+1}\ge x-1$
$\lim_{x\to4}\left(x-3\right)$
$\int\frac{2+x^2}{1+x^2}dx$
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