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

### Question Asked by a Student from EXXAMM.com Team

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.

#### HINT

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