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Let f(x)=(2x-pi)^3+2x-cosx ,"T h e n ,"d...

Let `f(x)=(2x-pi)^3+2x-cosx ,"T h e n ,"d/(dx)[f^(- 1)(x)]` at `x=pi` is equal to :

A

`1//3`

B

`2//3`

C

1

D

`3pi^(2)+2`

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The correct Answer is:
A
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