find the equation to the straight lines joining the origin to the points in which the straight line y=mx+c cuts the circle, x^2+y^2=2ax+2by. hence find the condition that these points may subtend a right angle at origin
find the equation to the straight lines joining the origin to the points in which the straight line y=mx+c cuts the circle, x^2+y^2=2ax+2by. hence find the condition that these points may subtend a right angle at origin