11. Determine the solution of Utt = u (x,0) = 0, u (0, t) = h, where h, k, and A are constants. c²ur + Asinh xa, ut (x,0) = 0, u (l,t) = k, 0 < x < 1, 0≤x≤l, 1, t> 0, t> 0,

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