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Functions
hard
0:00.0
If
f
(
x
)
=
\ac
x
x
−
1
f(x) = \ac{x}{x-1}
f
(
x
)
=
\ac
x
x
−
1
, find
f
(
f
(
x
)
)
f(f(x))
f
(
f
(
x
))
.
A
x
x
x
B
1
/
x
1/x
1/
x
C
x
−
1
x-1
x
−
1
D
1
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