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5. Find a unit vector orthogonal to the triangle in R with vertices (0, 1, 1) , (2, 1, 3), and (-1, -1, -1). 6.

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5. Find a unit vector orthogonal to the triangle in R with vertices (0, 1, 1) , (2, 1, 3), and (-1, -1, -1). 6. (a) Are the points (1, 0, 2), (4, 1, 1), and (-5, -2, 4) collinear in R3? (b) Are the points (1, 0, 2), (4, 1, 3), (5, -2, 4), and (0, 0, 1) coplanar in IR3

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