The solution of a reduced cubic equation of the form X^3+A2*X^2+A1*X+A0=0. The roots of an algebraic equation can be real and complex conjugate, and on the complex plane they all lie within the ring bounded by circles with radii R=1+|Amax An| and r=|A'max/An|, where Amax is the largest modulo coefficient of the polynomial. A'max is the next highest modulus coefficient (that is, excluding Amax).
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