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If f(x)=sqrt(x^(2)-2x+1), then f' (x) ?...

If `f(x)=sqrt(x^(2)-2x+1),` then f' (x) ?

A

`f'(x)=1" for all "x`

B

`f'(x)=-1" for all "xle1`

C

`f'(x)=1" for all "xgt1`

D

none of these

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The correct Answer is:
D
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