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Problem
Problem
Let
f
(
x
)
=
x
2
−
4
x
2
+
4
f(x) = \frac{x^2 - 4}{x^2 + 4}
f
(
x
)
=
x
2
+
4
x
2
−
4
for
∣
x
∣
>
2
|x| > 2
∣
x
∣
>
2
, then the function
f
:
(
−
∞
,
−
2
]
∪
[
2
,
∞
)
→
(
−
1
,
1
)
f: (-\infty, -2] \cup [2, \infty) \rightarrow (-1, 1)
f
:
(
−
∞
,
−
2
]
∪
[
2
,
∞
)
→
(
−
1
,
1
)
is (a) One-one into (b) One-one onto (c) Many one into (d) Many one onto
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