Question: Let a = [1, 1, 0], b = [3, 2, 1], and c = [1, 0, 2]. Find the angle between: a + c, b

Let a = [1, 1, 0], b = [3, 2, 1], and c = [1, 0, 2]. Find the angle between:

a + c,    b + c

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