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If f:Rto is defined by f(x)=(1-x)/(1+x)....

If `f:Rto` is defined by `f(x)=(1-x)/(1+x)`. Then the composition `(fofofof) (x)` has the value

A

`+4x`

B

`((1-x)/(1+x))^(4)`

C

x

D

`(1-x)/(1+x)`.

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The correct Answer is:
C
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