If \( f(x)=\frac{x}{x-1} \), then \( \frac{f(a)}{f(a+1)}= \) P (a) ...

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If \( f(x)=\frac{x}{x-1} \), then \( \frac{f(a)}{f(a+1)}= \)
P
(a) \( \mathrm{f}(-\mathrm{a}) \)
(b) \( \mathrm{f}\left(\frac{1}{\mathrm{a}}\right) \)
(c) \( \mathrm{f}\left(\mathrm{a}^{2}\right) \)
(d) \( \mathrm{f}\left(\frac{-\mathrm{a}}{\mathrm{a}-1}\right) \)
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