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The range of the function f(x) = (...

The range of the function
` f(x) = (x^2 -x+1)/(x^2 +x+1)` where ` x in R `, is

A

`(-oo , 3]`

B

`(-oo,oo)`

C

`[3,oo)`

D

`[1/3,3]`

Text Solution

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The correct Answer is:
D
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