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If vec(a), vec(b), vec(c ) are three vec...

If `vec(a), vec(b), vec(c )` are three vectors such that `vec(a)+vec(b)+vec(c )=0`, then prove that :
`vec(a)xx vec(b)=vec(b)xx vec(c )=vec(c )xx vec(a)` and hence, show that `[vec(a)vec(b)vec(c )]=0`.

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