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    Basically i just solved it, but have constants A and B that will only satisfy the boundary condition y(0) = y(pi) = 0 if A = B... But according to how the question is worded, I'm meant to be able to do the first part without knowing the boundary conditions, but solely on the fact that n is positive integer?
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    y(0) = y(pi) = 0 *are* boundary conditions.

    If you don't assume n to be an integer, you should find that you need A=B=0. It's only for particular values of n that you can get a non-zero solution.
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    thanks
 
 
 
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