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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, 1) and (-5, -5, -2).

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The correct Answer is:
`lt (2)/(sqrt(17)), (2)/(sqrt(17)),(-3)/(sqrt(17)), lt (2)/(sqrt(17)),(3)/(sqrt(17)),(2)/(sqrt(17)),lt (4)/(sqrt(42)),(5)/(sqrt(42)),(-1)/(sqrt(42)) gt ` .
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