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If lim(x to oo) (sqrt(x^(2) -x+1) -ax)=b...

If `lim_(x to oo) (sqrt(x^(2) -x+1) -ax)=b`, then the ordered pair (a, b) is :

A

`(1, (1)/(2))`

B

`(-1, -(1)/(2))`

C

`(1, -(1)/(2))`

D

`(-1, (1)/(2))`

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