@tomleslie 

I've tried to simplify the problem by only providing the final equation. The truth is that I'm trying to solve U for the 4 boundary conditions BC1, BC2, BC3 and BC4 as shown in the attatched file. The equation that I've previously showed you is the general solution when the parameters are not given specific values. I'd hope that I'd could export that final solution to my excel spreadsheet and that it would calculate the things that I needed it to calculate.

First thing is to solve U with the 4 BC's equal to zero and find the value for beta and consequently, omega. Then, the last 2 BC's are given values and the whole thing is solved again for the "new" boundary conditions. That way I can find U(x) in the whole 0<=x<=Lm range.

calculo_ressonancia_rev06.mw

@tomleslie 

Thank you for your answer.

1. You could try to solve for these values:

with beta beeing 0,617 and omega 136,55.

F15 is basically x. Varying from 0 to Lm.

2.SEN and SENH are SIN and SINH in portuguese. I have to input them that way otherwise excel won't recognize the functions. You can quickly change these with CTRL + F both in Maple and Excel.