The acute angle between two lines whose direction cosines are given by – InterviewSolution

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1.	The acute angle between two lines whose direction cosines are given by the relation between l+m+n=0 and l2+m2−n2=0 is
Answer» The acute angle between two lines whose direction cosines are given by the relation between $l + m + n = 0$ and $l^{2} + m^{2} - n^{2} = 0$ is

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