\( \lim _{x \rightarrow \infty}\left\{\frac{x^{3}+1}{x^{2}+1}-(a x+b)\right\}=2 \), then \( a b= \)

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\( \lim _{x \rightarrow \infty}\left\{\frac{x^{3}+1}{x^{2}+1}-(a x+b)\right\}=2 \), then \( a b= \)
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