This exercise gives another proof of the relation between the dot product and the angle
Chapter 12, Problem 93(choose chapter or problem)
This exercise gives another proof of the relation between the dot product and the angle between two vectors v = a1, b1 and w = a2, b2 in the plane. Observe that v = v cos 1,sin 1 and w = w cos 2,sin 2, with 1 and 2 as in Figure 24. Then
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