Therefore, in the XY coordinate system with oval focal length is between (0, 0) to (1, 1) is equal to 23, will be whether the c = 23 and from the length axis of the ellipse is equal to the length of the axis, 2a kho ongwong RI equal to core documents and 2b since the master of the ellipse in the XY and the XY coordinates systems are equal in length.
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