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If vec a,vec b,vec c are three non-copl...

If `vec a,vec b,vec c` are three non-coplanar non-zero vectors and `vec r` is any vector in space, then `(vec a xx vec b) xx(vec r xx vec c) + (vec b xx vec c) xx(vec r xx vec a) + (vec c xx vec a) xx(vec r xx vec b)` is equal to

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