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show that (x, y, z) = 2xyz i + (x3+y) j+xyk is irrotational and also find a Scalar function u(x, y, z) such that

show that (x, y, z) = 2xyz i + (x3+y) j+xyk is irrotational and also find a Scalar function u(x, y, z) such that = grad ()

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