Which expression represents the scalar curl of a 2D vector field F=⟨P(x,y),Q(x,y)⟩\mathbf{F} = \langle P(x, y), Q(x, y) \rangleF=⟨P(x,y),Q(x,y)⟩?
∂Q∂x+∂P∂y\frac{\partial Q}{\partial x} + \frac{\partial P}{\partial y}∂x∂Q+∂y∂P
∂P∂x−∂Q∂y\frac{\partial P}{\partial x} - \frac{\partial Q}{\partial y}∂x∂P−∂y∂Q
∂Q∂x−∂P∂y\frac{\partial Q}{\partial x} - \frac{\partial P}{\partial y}∂x∂Q−∂y∂P
∂P∂x+∂Q∂y\frac{\partial P}{\partial x} + \frac{\partial Q}{\partial y}∂x∂P+∂y∂Q