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If f (x) =(alphax)/(x+1) (x ne -1), then...

If `f (x) =(alphax)/(x+1) (x ne -1),` then the value of `alpha` for which `f {f(x)}=x` is-

A

`sqrt2`

B

`-sqrt2`

C

`-1`

D

1

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The correct Answer is:
C
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CHHAYA PUBLICATION-MCQ's-QUESTION PAPER 6
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