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if a,b,c are unit vectors such that a+b+c =0 and (a,b)=pi/3,then l a x b l +l b x cl +lc xal |
| Answer» if a,b,c are unit vectors such that a+b+c =0 and (a,b)=pi/3,then l a x b l +l b x cl +lc xal | |