D2x=2*Dy+x-(u1*(x+u))/r1^3-(u*(x-u1))/r2^3;
D2y=-2*Dx+y-u1*u/r1^3-u*y/r2^3;
u=1/82.45;u1=1-u;
r1=sqrt((x+u)^2+y^2),r2=sqrt((x-u1)^2+y^2)

x(0)=1.2  Dx(0)=0 y(0)=0 Dy(0)=-1.04935751