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Let the function f be defined by f(x) = ...

Let the function `f` be defined by `f(x) = ((2x +1) / (1-3x))` then `f^-1 (x)` is

A

`(x-1)/(3x+2)`

B

`(3x+2)/(x-1)`

C

`(x+1)/(3x-2)`

D

none of these.

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The correct Answer is:
A
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