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If l(i)^(2)+m(i)^(2)+n(i)^(2)=1, (i=1,2,...

If `l_(i)^(2)+m_(i)^(2)+n_(i)^(2)=1`, (i=1,2,3) and `l_(i)l_(j)+m_(i)m_(j)+n_(i)n_(j)=0,(i ne j,i,j=1,2,3)` and `Delta=|{:(l_(1),m_(1),n_(1)),(l_(2),m_(2),n_(2)),(l_(3),m_(3),n_(3)):}|` then

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