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If `barc=3bara-2barb`, then prove that `[bara barb barc]0` |
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Answer» Given `" "vecc=3veca-2vecb` `therefore" "[vec a vec b vec c]=veca . (vecb xx vec)` `=veca . [vecb xx (3 veca xx2vecb)]` `=veca. (3 vecb xx veca - 2 vecb xx vecb)` `=veca.(3vecb xx vec a -0)` `(because vecb xx vec b=0)` `=3xx0=0" Hence proved"` |
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