Find the angle between the lines whose direction cosines are connected by the relations $l + m + n = 0 a n d 2 l m + 2 n l - m n = 0 .$

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Find the angle between the lines whose direction cosines are connected by the relations

l + m + n = 0 a n d 2 l m + 2 n l - m n = 0 .

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Find the angle between the lines whose direction cosines are connected by the relations

l + m + n = 0 a n d 2 l m + 2 n l - m n = 0 .

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