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In Exercises 13-18, determine whether the two vectors are orthogonal and if not, whether the angle between them is acute or obtuse. 1, 1, 1 , 1, -2, -2 1, 1, 1 , 3, -2, -1 0, 2, 4 , 3, 1, 0 0, 2, 4 , -5, 0, 0 4, 3 , 2, -4 12, 6 , 2, -4 In Exercises 19-22. find the cosine of the angle between the vectors. 0, 3, 1 , 4, 0, 0 1, 1, 1 , 2, -1, 2 i + j, j + 2k 3i + k, i + j + k In Exercises 23 28, find the angle between the vectors. 1, 2), 3, 5 0, -4 , 1, 3
Show transcribed image text In Exercises 13-18, determine whether the two vectors are orthogonal and if not, whether the angle between them is acute or obtuse. 1, 1, 1 , 1, -2, -2 1, 1, 1 , 3, -2, -1 0, 2, 4 , 3, 1, 0 0, 2, 4 , -5, 0, 0 4, 3 , 2, -4 12, 6 , 2, -4 In Exercises 19-22. find the cosine of the angle between the vectors. 0, 3, 1 , 4, 0, 0 1, 1, 1 , 2, -1, 2 i + j, j + 2k 3i + k, i + j + k In Exercises 23 28, find the angle between the vectors. 1, 2), 3, 5 0, -4 , 1, 3