$\lim_{x\to1}\left(\frac{\frac{1}{x}-1}{1-x}\right)$
$\frac{x^5-x^4+x^2-2}{x^2+1}3$
$-3x^2+12x+12$
$u=ln\left(\sqrt{x^2+y^2}\right)$
$\frac{x-5}{8}=\frac{x}{16}$
$11+\left|3-\left(-6\right)^2\right|$
$\frac{dy}{dx}=\frac{e^{-x-y}}{y}$
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