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lim_{x\to+\infty} \frac{x+1}{\sqrt{x^2+x}-\sqrt{x^2+1}}\cdot\ln(\frac{x+2}{x+3})
lim_{x\to+\infty} \frac{x+1}{\sqrt{x^2+x}-\sqrt{x^2+1}}\cdot\ln(\frac{x+2}{x+3})
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