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If a line has direction ratios -18,12,-4...

If a line has direction ratios `-18,12,-4`, then what are its direction cosines ?

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The correct Answer is:
`((-9)/(11),(6)/(11),(-2)/(11))" or "((9)/(11),(-6)/(11),(2)/(11))`
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OMEGA PUBLICATION-THREE DIMENSIONAL GEOMETRY -Questions
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