Solved: In each of 19 through 21, verify that each given function is a solution of the
Chapter 1, Problem 19(choose chapter or problem)
In each of 19 through 21, verify that each given function is a solution of the given partial differential equation. uxx + uyy = 0; u1( x, y) = cos x cosh y, u2( x, y) = ln( x2 + y2)
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