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Let f:R to R, where f (x) =(x^(2) +ax+1)...

Let `f:R to R,` where `f (x) =(x^(2) +ax+1)/(x ^(2)+ x+1).` Then the complete set of values of 'a' such that f(x) is onto is :

A

`(-oo, oo)`

B

`(-oo, 0)`

C

`(0,oo)`

D

not possible

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The correct Answer is:
D
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