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f:RtoR,f(x) is differentiable such that...

`f:RtoR`,f(x) is differentiable such that `f(f(x))=k(x^(5)+x),(kne0)`. Then f(x) is always

A

increasing

B

decreasing

C

either increasing or decreasing

D

non - monotonic

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The correct Answer is:
C
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