The line pair joining the origin to the points A and B of intersection of the conic and is If angle AOB is a right angle, show that AB touches the circle I have no idea how to do this. Any pointers? Thanks a million!
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If angle AOB is a right angle, Or If lx + my = 1 is the tangent to a circle, the distance of this line from the center is equal to the radius. So the equation of the circle is
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