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Problem
Problem
If
y
=
f
(
x
)
=
x
+
2
x
−
1
y = f(x) = \frac{x+2}{x-1}
y
=
f
(
x
)
=
x
−
1
x
+
2
, then
x
=
x =
x
=
(a)
f
(
y
)
f(y)
f
(
y
)
(b)
2
f
(
y
)
2f(y)
2
f
(
y
)
(c)
1
f
(
y
)
\frac{1}{f(y)}
f
(
y
)
1
(d) None of these
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