t0 = Z2^2 U1 = X1*t0 t1 = Z1^2 U2 = X2*t1 t2 = Z2^3 S1 = Y1*t2 t3 = Z1^3 S2 = Y2*t3 P = U2-U1 R = S2-S1 t4 = U1+U2 t5 = R^2 t6 = P^2 t7 = t4*t6 X3 = t5-t7 t8 = U1+U2 t9 = R^2 t10 = P^2 t11 = t10*t8 t12 = 3*t11 t13 = 2*t9 t14 = t13+t12 t15 = S1+S2 error: not sure how to handle (R*(-t14)-P^3*t15)/2 t16 = Z2*P Z3 = Z1*t16