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| 1. |
f(x)=\left\{\begin{array}{l}{\frac{\sqrt{1+k x}-\sqrt{1-k x}}{x}, \text { if }-1 \leq x<0} \\ {\frac{2 x+1}{x-1}, \quad, \text { if } 0 \leq x<1} \\ {\frac{2 x+1}{x-1}, \quad, \text { if } 0 \leq x<1}\end{array}\right. |
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