The ellipse with semi-major axis a, eccentricity e and foci F1 and F2 intersects the circle with diameter F1 F2at the point P, which is one of the 4 points of intersection, as shown in the diagram. Let x be the length of PF1 and y the length of PF2.
(a) Considering P as a point on the circle, show that x2+ y2= 4a2 e2
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