The angle between the lines whose direction cosines satisfy the equati – InterviewSolution

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1.	The angle between the lines whose direction cosines satisfy the equations l+m+n=0,l2+m2−n2=0 is given by [MP PET 1993; RPET 2001]
Answer» The angle between the lines whose direction cosines satisfy the equations $l + m + n = 0, l^{2} + m^{2} - n^{2} = 0$ is given by [MP PET 1993; RPET 2001]

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