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