/* [wxMaxima batch file version 1] [ DO NOT EDIT BY HAND! ]*/
/* [ Created with wxMaxima version 14.12.1 ] */

/* [wxMaxima: input   start ] */
eq1:h=H+a*x+b*y+c*x*y;
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq2:h0=H+a*x0+b*y0+c*x0*y0;
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq3:h1=H+a*x1+b*y1+c*x1*y1;
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq4:h2=H+a*x2+b*y2+c*x2*y2;
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq5:h3=H+a*x3+b*y3+c*x3*y3;
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq6:solve([eq2,eq3,eq4,eq5],[a,b,c,H]);
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq7:subst(eq6,eq1);
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq8:dhbydh0=factor(diff(rhs(eq7),h0));
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq9:dhbydh1=factor(diff(rhs(eq7),h1));
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq10:dhbydh2=factor(diff(rhs(eq7),h2));
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq11:dhbydh3=factor(diff(rhs(eq7),h3));
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq12:(x1*x3*y2*y3-x0*x3*y2*y3-x1*x2*y2*y3+x0*x2*y2*y3-x2*x3*y1*y3+x0*
x3*y1*y3+x1*x2*y1*y3-x0*x1*y1*y3+x2*x3*y0*y3-x1*x3*y0*y3-x0*x2*y0*y3+x0*x1*y0*y3+x2*x3*y1*y2-x1*x3*y1*y2-x0*x2*y1*y2+x0*x1*y1*y2-x2*x3*y0*y2+x0*x3*y0*y2+x1*x2*y0*y2-x0*x1*y0*
y2+x1*x3*y0*y1-x0*x3*y0*y1-x1*x2*y0*y1+x0*x2*y0*y1)=d;
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq13:subst(eq12,eq8);
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq14:subst(eq12,eq9);
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq15:subst(eq12,eq10);
/* [wxMaxima: input   end   ] */

/* [wxMaxima: input   start ] */
eq16:subst(eq12,eq11);
/* [wxMaxima: input   end   ] */

/* Maxima can't load/batch files which end with a comment! */
"Created with wxMaxima"$