If (l(1), m(1), n(1)) , (l(2), m(2), n(2...

If `(l_(1), m_(1), n_(1)) , (l_(2), m_(2), n_(2))` are D.C's of two lines, then `(l_(1)m_(2)-l_(2)m_(1))^2+(m_(1)n_(2)-n_(1)m_(2))^2+(n_(1)l_(2)-n_(2)l_(1))^2+(l_(1)l_(2)+m_(1)m_(2)+n_(1)n_(2))^2=`

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