Thanks for your helps (now I am able to convert equations in scientific notation), nevertheless described error remains, I think it is due to complexity of manipulated equations.

Thanks for your helps (now I am able to convert equations in scientific notation), nevertheless described error remains, I think it is due to complexity of manipulated equations.

@epostma 

First of all, thank you very much for your usefull advices, but there isn't  a closed form solution, this is the real matter. I am supposed to plot all solutions for theta0(t),lambda1(t),lambda2(t) obtained by implicit Euler iteration: this is the damned problem otherwise Maple offers many other  solutions. I will try to reformulate a more complete question...

@epostma 

First of all, thank you very much for your usefull advices, but there isn't  a closed form solution, this is the real matter. I am supposed to plot all solutions for theta0(t),lambda1(t),lambda2(t) obtained by implicit Euler iteration: this is the damned problem otherwise Maple offers many other  solutions. I will try to reformulate a more complete question...

@Markiyan Hirnyk 


I respect Russian wisdom, the matter is there's not a closed form solution (as I imagined) . Your advices are a possible and usefull trick. I have to do a project for an engineering course, I am supposed to respect some tasks(solving the famous equation by maple command solve and then generating the matlab code to build some functions and plot in Matlab all the unknowns: theta0(t),lambda1(t),lambda2(t)), this is the damned problem. If it were possible to preserve implicit Euler scheme in maple and plotting solutions it would be a positive outcome.
I will try to reformulate  another question : more complete...

@Markiyan Hirnyk 


I respect Russian wisdom, the matter is there's not a closed form solution (as I imagined) . Your advices are a possible and usefull trick. I have to do a project for an engineering course, I am supposed to respect some tasks(solving the famous equation by maple command solve and then generating the matlab code to build some functions and plot in Matlab all the unknowns: theta0(t),lambda1(t),lambda2(t)), this is the damned problem. If it were possible to preserve implicit Euler scheme in maple and plotting solutions it would be a positive outcome.
I will try to reformulate  another question : more complete...

Thank you very much for your answer but my problem consists into isolating the unknown theta0(k+1):
lambda1(k+1) and lambda2(k+1) are lagrangian multipliers that I have already isolate in other equations , if I could isolate theta0(k+1) I would then been able to implement a numerical integration scheme based on implicit Euler method,

Thank you very much for your answer but my problem consists into isolating the unknown theta0(k+1):
lambda1(k+1) and lambda2(k+1) are lagrangian multipliers that I have already isolate in other equations , if I could isolate theta0(k+1) I would then been able to implement a numerical integration scheme based on implicit Euler method,