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Functions
medium
0:00.0
If
f
(
x
)
=
3
x
f(x) = 3^x
f
(
x
)
=
3
x
, evaluate
f
−
1
(
81
)
f^{-1}(81)
f
−
1
(
81
)
.
A
4
B
3
C
27
D
9
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