if 2x+y-4=0 is bisector of angles between the lines a(x-1)+b(y-2)=0 and c(x-1) + d(y-2)=0 then find other angular bisector.
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the two angle bisectors of lines are mutually perpendicular.therefore product of slopes is 0.Also point of intersection of lines is (1,2).Thus,equation of other angle bisector can be found by slope point form