Question

If u = Tan^(-1) ( x^2 +2y^2) show that x^2uxx + 2xyuxy + y^2 u yy = 2 sin u cos 3u

Answer 1

Answer:

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Step-by-step explanation:

If u = Tan^(-1) ( x^2 +2y^2) show that x^2uxx + 2xyuxy + y^2 u yy = 2 sin u cos 3u