I am solving a differential/algebra system of equations (actually the Euler-Lagrange case). The thing is that when I run the command, it does not returns error nor answer, it just repeats the very same line I write but with the expressions expanded. I attach the notebook.
Thank you so much!!! I really appreciate your help.
It is a nonlinear boundary value problem, unlikely to have a closed-form solution. Try NDSolve.