11.已知lim_(x to 0) (ln(1+frac(f(x))/(x)))(2^x-1)=3，则lim_(x to 0) (f(x))/(sqrt(1+x^2))-1=_.

11.已知$\lim_{x \to 0} \frac{\ln(1+\frac{f(x)}{x})}{2^{x}-1}=3$，则$\lim_{x \to 0} \frac{f(x)}{\sqrt{1+x^{2}}-1}=\_.$

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