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Problem 4 (10pt). Let w be a Cl 1-form defined on R2 that satisfies dw = 0. Show that there exists a C2 function f(x,

Problem 4 (10pt). Let w be a Cl 1-form defined on R2 that satisfies dw = 0. Show that there exists a C2 function f(x, y) such that df = w

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