Use an proof to show that
So we need to prove that if then
However I do not know where to go from here, I can not seem to manipulate the and relate it with with any inequalities.
Thank you all!
HallsOfIvy, please refer to my post in http://www.mathhelpforum.com/math-he...es-153726.html to see an example where your method fails. It fails because there are other ways to approach the limit point, not just straight lines. There is no way to reduce the 2 dimensional problem to a 1 dimensional problem unless it has circular symmetry around the point.