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The direction cosines of two lines are connected by relation {
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The direction cosines of two lines are connected by relation and 4l is the harmonic mean between m and n.
Then,

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The direction cosines of two lines are connected by relation and 4l is the harmonic mean between m and n.
Then,
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Question Text
The direction cosines of two lines are connected by relation and 4l is the harmonic mean between m and n.
Then,