[-R1*S1*U+S1+R1];
[];
[A,X1,Y1,X2,Y2,R1,R2,S1,S2];
[[-Y1^2-X1^2+2*A*X1+R1^2-A^2,-Y1^2-X1^2-2*A*X1+R2^2-A^2,R2+R1-2,-Y2^2-X2^2+2*A*X2+S1^2-A^2,-Y2^2-X2^2-2*A*X2+S2^2-A^2,S2+S1-2,X1*Y2-A*Y2-X2*Y1+A*Y1,-A^2*U+U-2],[A,X1-X2]];