Question: Find the angle between the two vectors u = (2, -1, 0, 1) and v = (-1,2,0,1). Find the distance between the following pair

Find the angle between the two vectors u = (2, -1, 0, 1) and v = (-1,2,0,1). Find the distance between the following pair of points: (4,2,0, 1), (0, 0,-1, 3). Prove that u and v are orthogonal vectors if and only if ||u + v|| = ||u|| + ||v||

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