If the segment joining (a,b), (c,d) subtends a right angle at the origin,then1)ac-bd=0 2)ac+bd=03)ab+cd=0 4)ab-cd=0
If the segment joining (a,b), (c,d) subtends a right angle at the origin,then
1)ac-bd=0 2)ac+bd=0
3)ab+cd=0 4)ab-cd=0
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