4. Solve the one-dimensional heat equation with the conditions w(0, t) = 20, w(2, t) = 50 4Tx + 17 sin- 2 6Tx + 9 sin- 2 9πα + (20 + 15x). w(x, 0) = 5 sin- 12 sin- 2 (Solve completely the eigenvalue problem involved).
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