If f : [1, oo) rarr [2, oo) is given by ...

If `f : [1, oo) rarr [2, oo)` is given by `f(x) = x + (1)/(x)` then `f^(-1)` (x) equals:

A

`(x+sqrt(x^(2)-4))/(2)`

B

`(x)/(1+x^(2))`

C

`(x-sqrt(x^(2)-4))/(2)`

D

`1+sqrt(x^(2)-4)`

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The correct Answer is:

A

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