For each of the following, find the Eigenfunction expansion of the given function in the eigenfunctions of the Sturm-Liouville problem. In each case, determine what this expansion converges to and graph the Nth partial sum of the expansion and the function on the same set of axes.

Partial differential equations. Please use matlab to graph.

This is all the information provided.

y" + dy = 0 f(x) = x 0