A2 It was shown in lectures that the wave equation 22 и Ət² = c2 მ2 J²u u(0,t) = 0, u(L,t) = 0, has general solution u(x,t) = sin ППХ nπct nπct An COS + bn sin L L L n=1 Explicitly find the coefficients an and bn for the following initial value problems ди (a) u(x, 0) = x(L-x), 4(x, 0) = 0, ди Ət (b) u(x, 0) = 0, (x, 0) = x(L- x).

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