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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` is :

A

16

B

8

C

4

D

2

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The correct Answer is:
A
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