Find the angle between the line whose direction cosines are given by $l + m + n = 0 a n d 2 l^{2} + 2 m^{2} - n^{2} - 0 .$

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Find the angle between the line whose direction cosines are given by

l + m + n = 0 a n d 2 l^{2} + 2 m^{2} - n^{2} - 0 .

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Find the angle between the line whose direction cosines are given by

l + m + n = 0 a n d 2 l^{2} + 2 m^{2} - n^{2} - 0 .

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