1. The problem statement, all variables and given/known data For arbitrary vector fields A and B show that: ∇.(A ∧ B) = B.(∇∧A) - A.(∇∧B) 3. The attempt at a solution I considered only the 'i'-axis, by saying that it is perpendicular with A and B and then I expanded both the left and right side out. The working is too much to post here..I didn't manage to prove it. I was hoping someone would know if there's a useful webpage where I can find out more about vector calculus identities. Thanks!