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If vec(a), vec(b) and vec(c ) are mutual...

If `vec(a), vec(b)` and `vec(c )` are mutually perpendicular unit vectors and `vec(a)xx vec(b)=vec(c )`, show that `vec(b)=vec(c )xx vec(a)` and `vec(a)=vec(b)xx vec(c )`.

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