If f is diffenrentiable at x = 1 , then ...

If f is diffenrentiable at x = 1 , then `underset (xto1) ("limit") (xf(1)-f(x))/(x-1)` is equal to :

A

f'(1)

B

0

C

`f(1)-f'(1)`

D

`f(1)+f(1)`

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The correct Answer is:

C

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