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If f:RtoA defined by f(x)=1/(x^(2)+2x+2)...

If `f:RtoA` defined by `f(x)=1/(x^(2)+2x+2),AAx inR` is surjective, then A =

A

`[1,oo]`

B

`(1,oo)`

C

[0, 1]

D

(0, 1]

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The correct Answer is:
D
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