Let f(x) be a strictly increasing and differentiable function, then $\underset{\mathrm{x}\to 0}{\mathrm{Lt}}\frac{\mathrm{f}\left({\mathrm{x}}^2\right)-\mathrm{f}\left(\mathrm{x}\right)}{\mathrm{f}\left(\mathrm{x}\right)-\mathrm{f}\left(0\right)}=$

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