If the direction cosines of two lines are connected by
P the equati...
If the direction cosines of two lines are connected by
P the equations \( l+m+n=0, l^{2}+m^{2}-n^{2}=0 \), then the
W angle between the lines, is
(1) \( \pi / 2 \)
(2) \( \pi / 3 \)
(3) \( \pi / 4 \)
(4) \( \pi / 6 \)
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