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Problem
Problem
If
f
(
x
)
=
x
−
3
x
+
1
f(x) = \frac{x-3}{x+1}
f
(
x
)
=
x
+
1
x
−
3
, then
f
(
f
(
f
(
x
)
)
)
f(f(f(x)))
f
(
f
(
f
(
x
)))
equals (a)
x
x
x
(b)
−
x
-x
−
x
(c)
x
2
\frac{x}{2}
2
x
(d)
−
1
x
-\frac{1}{x}
−
x
1
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