If the co-ordinates of the points A, B, C, D be (1, 2, 3), (4, 5, 7), (?4, 3, ?6) and (2, 9, 2) respectively, then the angle between the lines AB and CD is

If the co-ordinates of the points A, B, C, D be (1, 2, 3),

1.	If the co-ordinates of the points A, B, C, D be (1, 2, 3), (4, 5, 7), (?4, 3, ?6) and (2, 9, 2) respectively, then the angle between the lines AB and CD is
A.	\[\frac{\pi }{6}\]
B.	\[\frac{\pi }{4}\]
C.	\[\frac{\pi }{3}\]
D.	None of these
Answer» E.

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If the co-ordinates of the points A, B, C, D be (1, 2, 3), (4, 5, 7), (?4, 3, ?6) and (2, 9, 2) respectively, then the angle between the lines AB and CD is

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