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Let f(x)=(alphax)/(x+1),xne0, then for w...

Let `f(x)=(alphax)/(x+1),xne0`, then for what value of `alpha` is `f[f(x)]=x` ?

A

`sqrt(2)`

B

`-sqrt(2)`

C

`1`

D

`-1`

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The correct Answer is:
D
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