Parametric equation of second-order curve in 3d. Draghilev method.
PLAN_CURVE_3d_1.mw
Examples:
x1^2+x1*x3+13*x2^2+x3-1=0;
x1+x2+x3=0;


 x1^2+0.1*x2^2+x3^2-9=0;
 x1+3*x3+1=0;


 x1^2-0.1*x2^2+x3^2-9=0;
 x1+3*x3+1=0;


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