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Q 2369391215.     Under what condition are the two lines
`y = m/l x + alpha , z= n/l x + beta` and `y= (m')/(l') x + alpha '`,
`z =( n')/(l') x + beta'` orthogonal'?
NDA 2008 Paper 1
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)