Please help with this problem. It is a question about vibration of a string with Dirichlet boundary conditions.

3. Solve the problem utt = urx for e (0, 3), t 20 u(O t) u(:r, O) = 3 sin :r + 0.1 sin (r:r) O) = sin (67r:r) . 3. Solve the problem utt = urx for e (0, 3), t 20 u(O t) u(:r, O) = 3 sin :r + 0.1 sin (r:r) O) = sin (67r:r) .