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[" 15.If the vertices "A" ."B" ."C" of "...

[" 15.If the vertices "A" ."B" ."C" of "a" triangle "ABC" are "(1,2,3),(-1,0,0),(0,1,2}],[" respectively,then find "/_ABC//_ABC" is the angle between the vectors BA "],[" and "bar(BC)" )."]

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