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A and B are two points with coordinates ...

A and B are two points with coordinates `(x_(1),y_(1),z_(1))` and `(x_(2),y_(2),z_(2))`, respectively, in space. Let P and Q be feet of the perpendicular drawn from A and B to a line L whose direction ratios are l,m,n. Let `theta` be the angle between AB and L then find the value of `cos theta`

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