To start you off:Originally Posted by sam1986
Now apply the product rule to the what is inside the right most summation
and simplify and you should have what you want.
Need help proving this
let f(x,y,z) and g(x,y,z) be any C^2 scaler functions. Without using the basic identities of vector analysis prove that
(ive put grad instead of the upside down triangle symbol)