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If f(x) = (x^2 -2x + 4)/(x^2+2x+4), x in...

If f(x) = `(x^2 -2x + 4)/(x^2+2x+4), x in R` then range of function is

A

`[0, infty)`

B

{1/3, 3]

C

`[3, infty)`

D

[0,3]

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The correct Answer is:
B
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