Question: Verify that Clairaut's theorem holds: 20. 22. u(x, y) 3 x3yxy x2+y2 3x2y2 + cos y

20. 22. u(x, y) 3 x3yxy x2+y2 3x2y2 + cos y

Verify that Clairaut's theorem holds:

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20. 22. u(x, y) 3 x3yxy x2+y2 3x2y2 + cos y

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