23. Given a = [1, 7, 9] and, 13 = [-2, 5, -3] and w = [4, -6, 8]. a) Find the angle between 13
23. Given a = [1, 7, 9] and, 13 = [-2, 5, -3] and w = [4, -6, 8]. a) Find the angle between 13 and W. [3 Marks] b) Are the vectors 5 and 1'5 and W coplanar? Show your answer algebraically. [3 Marks]
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