Question: subs command in differential equation

March 05 2014 SandorSzabo 602
Maple 13

I want to find the solution in a special form.
How can I do it?
Here is what I tried:



In the left hand side u_1 is not changed in  D(u_1).
I want to substitute and evalute (differentiate) it.

Thanks,  Sandor





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