[IIT 1984]
A) $ f(y) $
B) $ 2f(y) $
C) $ \frac{1}{f(y)} $
D) None of these
Correct Answer: A
$ y=\frac{x+2}{x-1}\Rightarrow x=\frac{3}{y-1}+1=\frac{y+2}{y-1}=f(y) $ .
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