1.

An ellipse with major and minor axis length as 2a and 2b units touches coordinate axis in first quadrant. If foci are (x1,y1) and (x2,y2), then the value of x1x2+y1y2 is

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An ellipse with major and minor axis length as 2a and 2b units touches coordinate axis in first quadrant. If foci are (x1,y1) and (x2,y2), then the value of x1x2+y1y2 is



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