Question: By expanding Eq. (58), Section 7.7 in rectangular coordinates, show that (59) is correct. Eq. (58) A ( A) 2 A

By expanding Eq. (58), Section 7.7 in rectangular coordinates, show that (59) is correct.

Eq. (58)

∇×∇×A ≡ ∇(∇ · A)−∇2A

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