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Use the index method to verify Griffiths' Eq. (vi) in Section 1.2.6 , the curl of...

Use the index method to verify Griffiths' Eq. (vi) in Section 1.2.6 , the curl of a cross product:

∇×(A×B) = (B·∇)A−(A·∇)B+A(∇·B)−B(∇·A)

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