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The range of (x^(2)-x+1)/(x^(2)+x+1) is...

The range of `(x^(2)-x+1)/(x^(2)+x+1)` is

A

`[(1)/(3), 3]`

B

`[(1)/(3), 1]`

C

`[1, 3]`

D

`(-oo, (1)/(3)]uu[3, oo)`

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