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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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Oct 9, 2013
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meena.p
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$(3)\;\frac{\pi}{3}$
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Nov 7, 2013
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pady_1
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