- #1
unscientific
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Homework Statement
Homework Equations
The Attempt at a Solution
For part (c), I showed that the tripple cross product = 2a using einstein notation. Then, I showed that 2∇(a.r) = 2a which is the same as LHS. I don't think this is as elegant as it can get..
How do I prove it directly? I've looked up some operator identities: