√(X1^2+X2^2+X3^2+X4^2-2*(X1*(X2+X3+X4)+X2*(X3+X4)+X3*X4))=0

X1=(X2+X3+X4)±2*√(X2*(X3+X4)+X3*X4)

X1=(X2+X3+X4)+2*√(X2*(X3+X4)+X3*X4)
X2=X1-X3-X4+2*√(X2*(X3+X4)+X3*X4)

X2=(X1+X3+X4)±2*√(X1*(X3+X4)+X3*X4)
X2=(X1+X3+X4)-2*√(X1*(X3+X4)+X3*X4)

-X3-X4+2*√(X2*(X3+X4)+X3*X4)=+X3+X4)-2*√(X1*(X3+X4)+X3*X4)

√(X2*(X3+X4)+X3*X4)+√(X1*(X3+X4)+X3*X4)=(X3+X4)

(X2*(X3+X4)+X3*X4)^3+(X1*(X3+X4)+X3*X4)^3≠(X3+X4)^6