compute A = 1/Z1 compute X3 = A X1 compute Y3 = A Y1 compute Z3 = 1 compute XX3 = X3^2 compute YY3 = Y3^2 compute ZZ3 = 1 compute XZ3 = 2 X3 compute YZ3 = 2 Y3 compute XY3 = XZ3 Y3