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Find the direction cosines of the sides ...

Find the direction cosines of the sides of the triangle whose vertices are (3,5,-4), (-1,1,2) and (-5,-5,-2).

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The correct Answer is:
`((-2)/(sqrt(17)),(-2)/(sqrt(17)),(3)/(sqrt(17))),((-2)/(sqrt(17)),(-3)/(sqrt(17)),(-2)/(sqrt(17))),((4)/(sqrt(17)),(5)/(sqrt(17)),(1)/(sqrt(17))),`
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