Let a = [1, 1, 0], b = [3, 2, 1], and c = [1, 0, 2].
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Let a = [1, 1, 0], b = [3, 2, 1], and c = [1, 0, 2]. Find the angle between:
Deduce the law of cosines by using vectors a, b, and a - b.
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