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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:
`lt(2)/(sqrt(17)),(2)/(sqrt(17)),(-3)/(sqrt(17))gt,lt(2)/(sqrt(17)),(3)/(sqrt(17)),(2)/(sqrt(17))gt,lt(4)/(sqrt(42)),(5)/(sqrt(42)),(-1)/(sqrt(42))gt`
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