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X'' + λ*X = 0, how do I find the non-trivial solution in

*Mathematica 8*? It's giving me only the trivial solution.

In: ComplexExpand [DSolve[{u''[x] + \[Lambda]^2 u[x] == 0, u[0] == 0, u[a] == 0}, u[x], x]]

and the out: u[x]--> 0 which is the trivial soln

Thanks