In exercises 11-14, determine whether the orthogonal. 11. a = (2, – 1), b = (2, 4) %3D 12. a = 6i + 2j, b = -i+3j 13. a = 3i, b = 6j – 2k 14. a = (4, – 1, 1), b = (2, 4, 4)

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