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[" 6.If "vec a,vec b,vec c" and "vec d" ...

[" 6.If "vec a,vec b,vec c" and "vec d" are unit vectors such that "],[(vec a timesvec b)*(vec c timesvec d)=1" and "vec a*vec c=(1)/(2)," then "],[([" (a) ",vec a,vec b,vec c" are non-coplanar "],[" (b) ",vec b,vec c,vec d" are non-coplanar "],[" (c) "vec b,vec d" are non-parallel "],[" (d) "vec a,vec d" are parallel and "vec b,vec c" are parallel "]]

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