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12. Given |a| = 8,|| = 12, and | + b| = 16, find the angle 0 = (a,b) (the angle between the vectors

12. Given |a| = 8,|| = 12, and | + b| = 16, find the angle 0 = (a,b) (the angle between the vectors a and b when they are positioned tail to tail).

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