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9. Let v and V2 be nonzero vectors in 3-space having direction angles a, Bi, and a2, B2.12 respectively. Moreover, suppose the vectors are

9. Let v and V2 be nonzero vectors in 3-space having direction angles a, Bi, and a2, B2.12 respectively. Moreover, suppose the vectors are orthogonal. Show their direction cosines satisfy cosa cosa2+ cos B cos B2 + cos 1 cos 2 = 0

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