The direction cosines of the line joinin...

The direction cosines of the line joining the points (1,2,-3) and (-2,3,1) are

`-3,1,4`

`-1,5,-2`

`(-3)/(sqrt(26)),(1)/(sqrt(26)),(4)/(sqrt(26))`

`(-1)/(sqrt(30)),(5)/(sqrt(30)),(-2)/(sqrt(30))`

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