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## Homework Statement

Please see question attached

## Homework Equations

## The Attempt at a Solution

Ok so I've been able to do the first few parts and have derived that Wm,n = c pi / L (m^2 + n^2)

I've thus been able to show that the second lowest freq is a factor of root(5/2) times larger than the first and that there are two modes that have this frequency. But how do you do the next two parts?

How do I show that by combining them it is possible to have a node along either diagonal of the square? I guess I have to add the two solutions and subtract, but then how do I show that these nodes are along the diagonal?

Also what about the last part? How am i meant to deduce the fundamental mode for a triangular membrane?

Thanks!