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

Let f : R to R 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

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

D

[-5/3,-3/5]

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The correct Answer is:
A
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