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Ohh I get it now. Thanks very much, Trebla! :D

Hi everyone, I am having trouble with this conics question: Prove that the sum of the distances from any point P on the ellipse x^2/a^2 + y^2/b^2 = 1 to the two foci is equal to 2a. Do not use the paramatric form - use cartesian coordinates. Could someone please help me? :D Thank you!