Question: a) Find the angle between (-1, 2, 1) and (3, -1, 2). b) Find (-1, 2, 1) (3, -1, 2) and (3, -1, 2) (-1,

a) Find the angle between (-1, 2, 1) and (3, -1, 2). b) Find (-1, 2, 1) (3, -1, 2) and (3, -1, 2) (-1, 2, 1).

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