The angle between the lines whose direction cosines
satisfy equation \( l+m+n=0 \) and \( l^{2}=....
The angle between the lines whose direction cosines
\( \mathrm{P} \)
satisfy equation \( l+m+n=0 \) and \( l^{2}=m^{2}+n^{2} \), is
W
(1) \( \frac{\pi}{3} \)
(2) \( \frac{\pi}{4} \)
(3) \( \frac{\pi}{6} \)
(4) \( \frac{\pi}{2} \)
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