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[" 26.The angle between the lines whose ...

[" 26.The angle between the lines whose direction cosines satisfy the equations "(+m+n=0" and "r^(2)=m^(2)" ,"],[n^(2)" is "],[[" (1) "(pi)/(3)," (2) "(pi)/(4)," (3) "(pi)/(6)," (4) "(pi)/(2)]]

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