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CBSE XII
>>
Math
>>
Relations and Functions
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Q)
If the function
f
:
[
1
,
α
)
i
m
p
l
i
e
s
[
1
,
α
)
defined by
f
(
x
)
=
2
x
(
x
−
1
)
is invertible, find
f
−
1
(
x
)
(
A
)
f
−
1
=
1
+
√
1
+
4
l
o
g
2
x
2
(
B
)
f
−
1
=
1
−
√
1
+
4
l
o
g
2
x
2
(
C
)
f
−
1
=
1
−
√
1
−
4
l
o
g
2
x
2
(
D
)
f
−
1
=
1
+
√
1
−
4
l
o
g
2
x
2
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