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**Vector Calculus Proof Help Please :)**

Heya Ppl i have a problem i am trying to solve.

Prove that

(Delta) . ( (fi)F) = (fi)(Delta) . F + F . (Delta)(fi)

were these contain GRAD DIV in my opinion but i seem to not be able to get the answer.

F = Vector F where F = F1i + F2j + F3k is a vector field in R3 and (fi) the Greek symbol that looks similar to Theta is a fuction of x, y and z.