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Three vectors vec a ,\ vec b ,\ vec c...

Three vectors ` vec a ,\ vec b ,\ vec c` satisfy the condition ` vec a+ vec b+ vec c= vec0` . Evaluate the quantity `mu= vec adot vec b+ vec bdot vec c+ vec cdot vec a ,\ if\ | vec a|=1,\ | vec b|=4\ a n d\ | vec c|=2.`

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