2. What is the angle between the following two vectors: A = (5i +- 7k) lbf B = (-21 +3j - 9k) ft
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2. What is the angle between the following two vectors: A = (5i +- 7k) lbf B = (-21 +3j - 9k) ft
2. What is the angle between the following two vectors: A = (5i +- 7k) lbf B = (-21 +3j - 9k) ft
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