(2) Let \( f(x) = \left\{ \begin{array}{ll} \frac{\ln x}{x - 1}, & x > 0, x \neq 1 \\ 1, & x = 1 \end{array} \right. \). Then \( f'(1) = \)________
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(2) Let \( f(x) = \left\{ \begin{array}{ll} \frac{\ln x}{x - 1}, & x > 0, x \neq 1 \\ 1, & x = 1 \end{array} \right. \). Then \( f'(1) = \)________