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Find the angle between the lines, one of...

Find the angle between the lines, one of which is parallel to the line
`x/1=(y-1)/2=z/3` and other is a line passing through two points (1, 2, 4) and (4, 3, -1)?

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The correct Answer is:
`cos^(-1)((-sqrt(10))/(7))`
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AAKASH INSTITUTE-THREE DIMENSIONAL GEOMETRY -TRY YOURSELF
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