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curl of (e^(x+2y)*cos(3z-1)+2y^2,2e^(x+2y)*cos(3z-1)+4xy,-3e^(x+2y)*sin(3z-1))
curl of (e^(x+2y)*cos(3z-1)+2y^2,2e^(x+2y)*cos(3z-1)+4xy,-3e^(x+2y)*sin(3z-1))
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