Let f(x)=(alphax)/(x+1),x ne -1. Then, f...

Let `f(x)=(alphax)/(x+1),x ne -1`. Then, for what values of `alpha` is f[f(x)]=x?

A

`sqrt2`

B

`-sqrt2`

C

`1`

D

`-1`

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The correct Answer is:

D

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