$\frac{x^2-49}{x+7}$
$\frac{18a}{3ab^2}$
$2x\:\frac{dy}{dx}=4x^2y$
$\int\frac{\left(x+6\right)}{\left(x+2\right)^2}dx$
$\lim_{x\to0}\left(\frac{\sqrt{1+2x}-3}{\sqrt{x-2}\sqrt{2}}\right)$
$\sqrt{3}-1.94444$
$w^2-10w+25$
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