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Hello, i'm trying to proof that

∇×(a × b) = a(∇ · b) − b(∇ · a) + (b · ∇)a − (a · ∇)b

(where a & b are vectors)

But I'm stuck...

Probably because this isn't correct:

∇×(a × b) = a(∇b) - b(∇a) ?

But i don't know why!

Could somebody please help !

Kind regards

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# Vector equation

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