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If x in R , then range of (x^(2)-x+1)/(...

If `x in R `, then range of `(x^(2)-x+1)/(x^(2)+x+1)` is given by :

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The correct Answer is:
`(1)/(3) le (x^(2)+x+1)/(x^(2)-x+1) le 3`
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