Categories > 3-d > Line > The angle between the lines whose direction cosines are connected by the relations $l+m+n=0$ and $2lm+2nl-mn=0$, is

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Question: The angle between the lines whose direction cosines are connected by the relations $l+m+n=0$ and $2lm+2nl-mn=0$, is


1) $\frac{\pi }{3}$
2) $\frac{2\pi }{3}$
3) $\pi $
4) None of these
Solution: Explanation: No Explanation
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