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Let f : R to R be a differentiable funct...

Let `f : R to R` be a differentiable function and `f (1) = 4.` Then the value of ` lim_( x to 1) int _(4) ^(f (x)) (2t)/(x -1) dt, if f '(1)= 2` is :

A

16

B

8

C

4

D

2

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The correct Answer is:
A
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