If \( x^{2}-x+1 \) is a factor of \( x^{4}+a x^{2}+b \), then the values of \( a \) and \( b \) ...

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If \( x^{2}-x+1 \) is a factor of \( x^{4}+a x^{2}+b \), then the values of \( a \) and \( b \) are respectively
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