題組內容

4.(40%). Consider a 1D wave cquation

(b). (20%). Find a solution that satisfies the boundary conditions u(O,t) = 0 and u(1,t) = sinwt for t ＞ 0, and the initial conditions u(x,0) = 0 and u_t(x,0) = 0 for 0 ＜x＜1.