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[" 15.If "vec b" and "vec c" are any two...

[" 15.If "vec b" and "vec c" are any two non-collinear unit vectors and "vec a" is "],[" any vector,then "(vec a*vec b)vec b+(vec a*vec c)vec c+(vec a*(vec b timesvec c))/(|vec b timesvec c|)(vec b timesvec c)=dots]

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