Vectors A, B, and C for a triangle as shown in Figure. The angle between A and

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Vectors A, B, and C for a triangle as shown in Figure. The angle between A and B is θ, and the vectors are related by C = A - B. Compute C·C in terms of A, B, and θ, and derive the law of cosines, C2 = A2 + B2 - 2AB cos θ.

B

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