If θ is the angle between lines whose direction ratios is given by a� – InterviewSolution

1.	If θ is the angle between lines whose direction ratios is given by a−b+c=0 and 3ab+bc=0, then 7cos2θ−1=
Answer» If $θ$ is the angle between lines whose direction ratios is given by $a - b + c = 0$ and $3 a b + b c = 0,$ then $7 {cos}^{2} θ - 1 =$

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