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Let f: X -> Ybe an invertible function....

Let `f: X -> Y`be an invertible function. Show that the inverse of `f^(-1)`is f, i.e., `(f^(-1))^(-1)= f`.

A

`[pi/4,(5pi)/4] rarr [sqrt(2),3sqrt(2)]`

B

`[-pi/4,(3pi)/4] rarr [sqrt(2),3sqrt(2)]`

C

`[-(3pi)/4,(3pi)/4] rarr [sqrt(2),-3sqrt(2)]`

D

`[-(3pi)/4,-pi/4] rarr [sqrt(2),3sqrt(2)]`

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The correct Answer is:
A
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