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Let f:RR to RR be defined as f(x)=(x^2-x...

Let `f:RR to RR` be defined as `f(x)=(x^2-x+4)/(x^2+x+4).` Then the range of the function f(x) is____

A

`[3/5,5/3]`

B

`(3/5,5/3)`

C

`(-oo,3/5)cup(5/3,oo)`

D

`[-5/3,-3/5]`

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