If , where , show that &2 u &x 2 1 &2 u &x 2 2 &2 u &x 2 n
Chapter 11, Problem 11.3.62(choose chapter or problem)
If , where , show that &2 u &x 2 1 &2 u &x 2 2 &2 u &x 2 n u a2
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