I still don't get it, what is worng? :S
U(x,y)=u(x,-y) and V(x,y)=-v(x,-y)
\dfrac{\partial U(x,y)}{\partial x} =\dfrac{\partial u(x,-y)}{\partial x} = \dfrac{\partial u(x,y)}{\partial x}
\dfrac{\partial U(x,y)}{\partial y} =\dfrac{\partial u(x,-y)}{\partial y} = - \dfrac{\partial u(x,y)}{\partial y}
\dfrac{\partial V(x,y)}{\partial x} =\dfrac{\partial (-v(x,-y))}{\partial x} = -\dfrac{\partial v(x,y)}{\partial x}
\dfrac{\partial V(x,y)}{\partial y} =\dfrac{\partial (-v(x,-y))}{\partial y} = \dfrac{\partial v(x,y)}{\partial y}
Is apparently wrong, how would you do this Dick? Dont show me all, just show for one of them, then I try more myself.
thanks.