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