# DSolve[ ] returns Input again?

Posted 1 month ago
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 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. Attachments:
 It is a nonlinear boundary value problem, unlikely to have a closed-form solution. Try NDSolve.