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The range of the function f(x)=(x^2-x+1)...

The range of the function `f(x)=(x^2-x+1)/(x^2+x+1)` where `x , in R` is a)`(-infty, 3]` b)`(-infty, infty)` c)`[3, infty)` d)`[1/3,3]`

A

`(-infty, 3]`

B

`(-infty, infty)`

C

`[3, infty)`

D

`[1/3,3]`

Text Solution

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The correct Answer is:
D
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