ive been trying to understand a few of the identities my professor gave me and i can get a few of them down such as
\nabla(\vec{A}\vec{B})=\vec{B}\nabla\vec{A} - \vec{A}\nabla\vec{B}
and i can break it down through cartesian and product rules but when i try to do
\nabla X (\vec{A}ψ) =...