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If (x^2+a x+3)/(x^2+x+a) takes all real ...

If `(x^2+a x+3)/(x^2+x+a)` takes all real values for possible real values of `x ,` then a.`a^3-9a+12<=0` b. `4a^3+39 < 0` c. `ageq1/4` d. `a<1/4`

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