If the function \( \mathrm{f} \) defined on \( \left(-\frac{1}{3}, \frac{1}{3}\right) \) by \( \...

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If the function \( \mathrm{f} \) defined on \( \left(-\frac{1}{3}, \frac{1}{3}\right) \) by \( \mathrm{f}(\mathrm{x})= \)
P
\( \left\{\begin{array}{ll}\frac{1}{x} \log _{\mathrm{c}}\left(\frac{1+3 x}{1-2 x}\right), & \text { when } x \neq 0 \\ k & , \text { when } x=0\end{array}\right. \)
W is continuous, then \( \mathrm{k} \) is equal to
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