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The abscissa and ordinates of the endpoi...

The abscissa and ordinates of the endpoints `Aa n dB` of a focal chord of the parabola `y^2=4x` are, respectively, the roots of equations `x^2-3x+a=0` and `y^2+6y+b=0` . Then find the equation of the circle with `A B` as diameter.

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