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Problem
Problem
If
f
(
x
)
=
x
1
+
x
2
f(x) = \frac{x}{\sqrt{1+x^2}}
f
(
x
)
=
1
+
x
2
x
, then
(
f
∘
f
∘
f
)
(
x
)
=
(f \circ f \circ f)(x) =
(
f
∘
f
∘
f
)
(
x
)
=
(a)
3
x
1
+
x
2
\frac{3x}{\sqrt{1+x^2}}
1
+
x
2
3
x
(b)
x
1
+
3
x
2
\frac{x}{\sqrt{1+3x^2}}
1
+
3
x
2
x
(d) None of these
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