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vec(a)= 2vec(i) + vec(j) -vec(k), vec(b)...

`vec(a)= 2vec(i) + vec(j) -vec(k), vec(b)= -vec(i) + 2vec(j)- 4vec(k) and vec(c )= vec(i) + vec(j) + vec(k)`, then find `(vec(a) xx vec(b)).(vec(b) xx vec(c ))`.

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