I need to find where . I know that the definition says that this distance is the greatest lower bound of . So the distance between and then I am not sure what to do.
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The easy way is to write the equation of the line through . Find the its intersection with the circle. One of those two points is the closest.
Thanks so much! I had made this problem quite hard by trying to use polar coordinates, but this method is much simpler. Thank you so much!