f: RvecR ,f(x) is differentiable such th...

`f: RvecR ,f(x)` is differentiable such that `f(f(x))=k(x^5+x),k!=0)dot` Then `f(x)` is always increasing (b) decreasing either increasing or decreasing non-monotonic

A

-1

B

-2

C

1

D

none of these

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The correct Answer is:

C

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