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Question

Find the equations of the straight lines bisecting the angles between the pairs of straight lines : 12x27xy12y2=0;71x2+94xy71y2=0;x2y2=0

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Solution

For a pair of straight lines given by the equationax2+2hxy+by2=0,equation of the angle bisectors is given byx2y2ab=xyh

  • Equation of the pair of straight lines is12x27xy12y2=0a=12,b=12andh=72Equation of the angle bisector is x2y224=2xy7or7x2+48xy7y2=0


  • Equation of the pair of straight lines is71x2+94xy71y2=0a=71,b=71andh=47Equation of the angle bisector is x2y2142=xy47or47x2142xy47y2=0


  • Equation of the pair of straight lines isx2y2=0a=1,b=1andh=0Equation of the angle bisector is x2y22=xy0orxy=0

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