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[" 21.If "vec u,vec v" and "vec w" are t...

[" 21.If "vec u,vec v" and "vec w" are three non- coplanar vectors,then "],[(vec u+vec v-vec w)*(vec u-vec v)times(vec v-vec w)" equals "],[[" (a) "3vec u*vec v timesvec w," (b) "0],[" (c) "vec u*vec v timesvec w," (d) "vec u*vec w timesvec v]]

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