Find the range of f(x)(x^2-x+1)/(x^2+x+1...

Find the range of `f(x)(x^2-x+1)/(x^2+x+1)`

A

`(-oo, (1)/(3))`

B

`(3. oo)`

C

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

D

[-1, 1]

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The correct Answer is:

C

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