Question: In Exercises, find the angle between the given pairs of n-vectors and the unit n-vector associated with each vector.
Exercise:1. (3, 1, 2, 1), (1, -1, 2, 2)
2. (4, 1, 0, 2), (2, -1, 2, 1)
3. (2, -2, -2, 4), (1, -1, -1,2)
4. (2, 1, -1, 1), (1, -2, 2, 2)