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[" If "f(x)=sqrt(x^(2)-2x+1)" ,then "],[...

[" If "f(x)=sqrt(x^(2)-2x+1)" ,then "],[[" (a) "f'(x)=1" for all "x," (b) "f'(x)=-1" for all "x<=1],[" (c) "f'(x)=1" for all "x>=1," (d) none of these "]]

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