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Math Help - Angle between lines in 3d

  1. #1
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    Angle between lines in 3d

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

    l+m+n=0, l^2+m^2+n^2=0

    Please help
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  2. #2
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    Re: Angle between lines in 3d

    Hey Suvadip.

    If l,m,n are real then they must all equal 0 since x^2 >= 0 for all real x.
    Thanks from Suvadip
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