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Three vectors vec a,vec b and vec c sati...

Three vectors `vec a`,`vec b` and `vec c` satisfy the condition `vec a`+`vec b`+`vec c`=`vec 0`.Evaluate the quantity `mu=vec a.vec b+vec b.vec c+vec c.vec a`,if `|vec a|=1`,`|vec b|=4` and `|vec c|=2`

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