Derive this solution of the wave equation y,,=a²yxx (-[infinity] 0), which satisfies the conditions y(x, 0) = f(x), y,(x, 0) ·[infinity]0 < x <[infinity]0: 1 == y(x, t) = = = 6²° a(s - x) ds da. TT Also, reduce the solution to the in Example 2, Sec. 8: y(x, t) = = at) + f(x-at)]