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Let f(x)=(alphax)/((x+1)),x!=-1. The for...

Let `f(x)=(alphax)/((x+1)),x!=-1.` The for what value of `alpha` is `f(f(x))=x ?` `sqrt(2)` (b) `-sqrt(2)` (c) `1` (d) `-1`

A

`sqrt(2)`

B

`-sqrt(2)`

C

1

D

-1

Text Solution

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The correct Answer is:
D
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