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Let f(x)=a x^2+b x+a ,b ,c in Rdot If f...

Let `f(x)=a x^2+b x+a ,b ,c in Rdot` If `f(x)` takes real values for real values of `x` and non-real values for non-real values of `x` , then `a=0` b. `b=0` c. `c=0` d. nothing can be said about `a ,b ,cdot`

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