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[" Let "A(a)" and "B(b)" be points on two skew lines "vec r=vec a+lambdavec p" and "vec r=vec b+uq" and the shortest "],[" distance between the skew lines is "1" ,where "vec p" and "vec q" are unit vectors forming adjacent sides "],[" parallelogram enclosing an area of "(1)/(2)" units.If an angle between "AB" and the line of shortest dist "],[" is "60^(@)" ,then "AB=],[[" a."(1)/(2)," b."2," c."1," d."lambda in R-10}]]

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