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Find the direction cosines of the two li...

Find the direction cosines of the two lines which are connected by the relations `l-5m+3n=0,7l^(2)+5m^(2)-3n^(2)=0`

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The correct Answer is:
`((-1)/(sqrt(6)),(1)/(sqrt(6)),(2)/(sqrt(6))),((1)/(sqrt(14)),(2)/(sqrt(14)),(3)/(sqrt(14)))`
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