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    				| 1. | 
                                    If vec(u),vec(v),vec(w) are the non-coplanar vectors, then (vec(u)+vec(v)-vec(w)).[(vec(u)-vec(v))xx(vec(v)-vec(w))]= | 
                            
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Answer»  `VEC(U).(vec(V)xxvec(W))`  | 
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