If \( f(x)=\left\{\begin{array}{cc}\frac{x-1}{2 x^{2}-7 x+5} & \text { for } x \neq 1 \\ -\frac{...

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If \( f(x)=\left\{\begin{array}{cc}\frac{x-1}{2 x^{2}-7 x+5} & \text { for } x \neq 1 \\ -\frac{1}{3} & \text { for } x=1\end{array}\right. \), then \( f^{\prime}(1)= \)
P
(1) \( -1 / 9 \)
(2) \( -2 / 9 \)
(3) \( -1 / 3 \)
(4) \( 1 / 3 \)
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