ax^3+bx^2+cx+d=0
Q=(a^2-3b)/9=1.58,
R=(2a^3-9ab+27c)/54=-1.88,
S=Q^3-R^2=0.45
w=arccos(R/Q^3)/3
x1=-2*sqrt(Q)*cos(w)-a/3=-2
x2=-2*sqrt(Q)*cos(w+2pi/3)-a/3=2
x3=-2*sqrt(Q)*cos(w-2pi/3)-a/3=-1.5
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