Three vectors veca,vecb,"and" vecc satis...

Three vectors `veca,vecb,"and" vecc` satisfy the condition`veca+vecb+vecc=vec0`. Evaluate the quantity `mu=veca.vecb+vecb.vecc+vecc.veca`. If `|veca|=1,|vecb|=4 " and " |vecc|=2`.

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THREE DIMENSIONAL GEOMETRY
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