If f (x)=((x+1)^(7)sqrt(1+x ^(2)))/((x^(...

If `f (x)=((x+1)^(7)sqrt(1+x ^(2)))/((x^(2) -x+1)^(6)),` then the value of `f'(0)` is equal to:

A

10

B

11

C

13

D

15

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The correct Answer is:

C

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