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lim(x rarr oo)(ax^(2)+b^(2)x+a+bx^(2))/(...

`lim_(x rarr oo)(ax^(2)+b^(2)x+a+bx^(2))/(b+ax)=1` then `a-b^(2)` is equal to
(A) `-1`
(B) `0`
(C) `1/2`
(D) `1`

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