Multiply the first by and the second by and substract so
.
Now integrate [0,L]
,
then sub in your BC's.
To start off, when this question asks without determining the explicit form of both and , what does that mean exactly? In other words, what is the explicit form?
Anyway we have....
Since all these BC's equal zero we therefore have
if
This is right, right?
Thanks very much for your help.