.
dx1/dt=x2
dx2/dt=-x1+b*(x3-x1)+e*(1-x1*x1)*x2
dx3/dt=x4
dx4/dt=-x3-d*x3+b*(x1-x3)+e*(1-x3*x3)*x4


   
 DX1/DT=X3
DX2/DT=X4
DX3/DT=-M*P*X1/(P*X1^2 + X2^2 )^(3/2)
DX4/DT=-M*X2/(p*X1^2 + X2^2 )^(3/2)








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