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If f:R rarr R^(+) such that f(x)=(1//3)^...

If `f:R rarr R^(+)` such that `f(x)=(1//3)^(x),` then `f^(-1)(x)=`

A

`(1//3)^(-x)`

B

`3^(x)`

C

`log_(1//3)x`

D

`log_(e)(1//3)`

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