Question: 12. Let D = be a nonzero vector in Ra. For each / = 1,2,3, let 8, denote the angle between 7 and e: 0

12. Let D = be a nonzero vector in Ra. For

12. Let D = be a nonzero vector in Ra. For each / = 1,2,3, let 8, denote the angle between 7 and e: 0 0 , and e; = Compute cos? 6 + cos' 62 + cos? (3

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