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nabla(a dot b)=(b dot nabla)a+(a dot nabla)b+b cross nabla cross a+a cross nabla cross b;

(a and b are all vectors)

when I was proving it,I found it impossible to go from right side to left side. I don't know whether '(b dot nabla)a = b (nabla a)' is right or not , when proving ,I found only when it is right can I prove the equation.

Can you help me to prove '(b dot nabla)a = b (nabla a)'? Thank you very much!

(I am a freshman)

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# Homework Help: Prove nabla(a dot b)

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