dx1:X1 = [-10,10]
dx2:X2 = [-10,10]
dx3:X3 = [-10,10]
dx4:X4 = [-10,10]
dx5:X5 = [-10,10]
dx6:X6 = [-10,10]

c1:X1^2 + X3^2             = 1
c2:X2^2 + X4^2             = 1
c3:X5*X3^3 + X6*X4^3       = 5
c4:X5*X1^3 + X6*X2^3       = 4
c5:X5*X1*X3^2 + X6*X4^2*X2 = 3
c6:X5*X1^2*X3 + X6*X2^2*X4 = 2 
