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

1.	The angle between the lines whose direction cosines satisfy the equations l+m+n=0 and l2=m2+n2, is
Answer» The angle between the lines whose direction cosines satisfy the equations $l + m + n = 0$ and $l^{2} = m^{2} + n^{2}$ , is

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