If \( f(x)=\left\{\begin{array}{cl}\frac{\log (1+a x)-\log (1-b x)}...

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If \( f(x)=\left\{\begin{array}{cl}\frac{\log (1+a x)-\log (1-b x)}{x}, & , x \neq 0 \\ k & , x=0\end{array}\right. \) and \( f(x) \) is continuous at \( x=0 \), then the value of \( k \) is
(a) \( a-b \)
(b) \( a+b \)
(c) \( \log a+\log b \)
(d) none of these
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