Question: prove (x2 4xy 2y?) dx + (y + 4xy 2x2) dy = 0 (x2 4xy 2y?) dx + (y + 4xy 2x2) dy = 0

prove
(x2 4xy 2y?) dx + (y + 4xy 2x2) dy = 0

(x2 4xy 2y?) dx + (y + 4xy 2x2) dy = 0 (x2 4xy 2y?) dx + (y + 4xy 2x2) dy = 0

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