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div E = 0

div H = 0

curl H = 1/c*([tex]\partial[/tex]E/[tex]\partial[/tex]t), find

[tex]\nabla[/tex] x ([tex]\nabla[/tex] x E)

how do i take [tex]\nabla[/tex] x curl E? i tried to do it by determinants, but i'm not sure which values correspond to the i, j, and k. so my next assumption is that there is some property that i can take advantage of to solve the problem. please help. thanks.