Answer: In each of 19 through 21, verify that each given function is a solution of the
Chapter 1, Problem 21(choose chapter or problem)
In each of 19 through 21, verify that each given function is a solution of the given partial differential equation. a2uxx = utt ; u1( x, t) = sin(x) sin(at), u2( x, t) = sin( x at), a real constant
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