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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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