a) Derive the solution for wave equation of a stretched flexible stri…

Question

a) Derive the solution for wave equation of a stretched flexible string of length L.

b) Solve: $(D^2 + 2D'^2 + 3DD' - 4D - 5D' + 3)z = 0$.

c) Find P.I. of $(D^2 + 3DD' + 2D'^2)z = \cos(2x-y)$.

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