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[" 1.The direction ratios of two lines a...

[" 1.The direction ratios of two lines are given by "],[a+b+c=0.2ab+2ac-bc=0" .Then the angle "],[" between the lines is "],[[" 1) "pi," 2) "(2 pi)/(3)," 3) "(pi)/(2)," 4) "2001" ] "]]

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