If , where and , show that &2 u &x 2 &2 u &y 2 e2s &2 u &s
Chapter 11, Problem 11.5.42(choose chapter or problem)
If , where and , show that &2 u &x 2 &2 u &y 2 e2s &2 u &s 2 &2 u &t 2 y e
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