The maximum value of \( \frac{x^{2}-x+1}{x^{2}+x+1} \) for all real...

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The maximum value of \( \frac{x^{2}-x+1}{x^{2}+x+1} \) for all real val- ues of \( x \) is ues of \( x \) is
(a) \( 1 / 2 \)
(b) 1
(c) 2
(d) 3
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