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Mathematics
The angle between the lines whose direction cosines satisfy the equations $l+m+n=0,l^2+m^2-n^2=0$ is :
\[\begin {array} {1 1} (1)\;\frac{\pi}{6} & \quad (2)\;\frac{\pi}{4} \\ (3)\;\frac{\pi}{3} & \quad (4)\;\frac{\pi}{2} \end {array}\]
jeemain
eamcet
math
2009
q32
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asked
Oct 9, 2013
by
meena.p
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1 Answer
$(3)\;\frac{\pi}{3}$
answered
Nov 7, 2013
by
pady_1
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