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

The angle between the lines whose direction cosines are connected by t

1.	The angle between the lines whose direction cosines are connected by the relations \[l+m+n=0\] and \[2lm+2nl-mn=0\], is
A.	\[\frac{\pi }{3}\]
B.	\[\frac{2\pi }{3}\]
C.	\[\pi \]
D.	None of these
Answer» C. \[\pi \]

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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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