[AMU 2001]
A) $ 1/f(x) $
B) $ 1/f(y) $
C) $ yf(x) $
D) $ f(y) $
Correct Answer: D
$ y=\frac{ax+b}{cx-a} $
Þ $ x(cy-a)=b+ay $
Þ $ x=\frac{ay+b}{cy-a}=f(y) $ .
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