a. Show that cos α = |v| cos B = b V cos Y = ਵਿਚ and cos²a+ cos²3 + cos²y = 1. These cosines are called the direction cosines of V. b. Unit vectors are built from direction cosines Show that if v = ai + bj + ck is a unit vector, then a, b, and c are the direction cosines of V.

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