If the coordinates of the points `A, B, C, D` be `(1, 2, 3), (4, 5, 7), (-4, 3, -6)` and `(2, 9, 2)` respectively, the

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Q 2677256186.     If the coordinates of the points `A, B, C, D` be
`(1, 2, 3), (4, 5, 7), (-4, 3, -6)` and `(2, 9, 2)`
respectively, then find the angle between the lines
`AB` and `CD`.

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(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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