Question: Let v be a nonzero vector. The angles , , between v and the unit vectors i, j, k are called the direction angles

Let v be a nonzero vector. The angles α, β, γ between v and the unit vectors i, j, k are called the direction angles of v (Figure 30). The cosines of these angles are called the direction cosines of v. Prove that

X Y

cos a + cos B+ cos y = 1

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