how do I do the chain rule for f(-$\Delta$)gh if f,g,h are functions and I want it written in terms of gradients.
I know f(-$\Delta$)g= $\nabla$f x $\nabla$g.
how do I do the chain rule for f(-$\Delta$)gh if f,g,h are functions and I want it written in terms of gradients.
I know f(-$\Delta$)g= $\nabla$f x $\nabla$g.
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