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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 + m + n = 0 an mn - 2nl - 2lm = 0.

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Thus the d.c's of the tow lines are `((1)/(sqrt(6)),(1)/(sqrt(6)),(-2)/(sqrt(6)));((1)/(sqrt(6)),(-2)/(sqrt(6)),(1)/(sqrt(6)))`
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