Question 3: Solve the following two problems using the generalized d'Alambert formula: (Utt-Uxx = -2ecos (t), t> 0,x € (-00,00) x € (-00,00) (A) u(x,0) = cos (x) u₂(x,0) = 1 XE (-00,00) Utt-4uxx = x, t> 0, x € (-00,00) (B) u(x,0) = x x € (-00,00) . (u₂(x,0) = sin(x) XE (-CO, CO)

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