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CONIC SECTIONS - NCERT
Focal distance of a point Let the equation of the parabola be y2 = 4ax and P(x, y) be a point on it. Then the distance of P from the focus (a, 0) is called the focal distance of the point, i.e., FP = ( )x a y− +2 2 = 2 ( ) 4x a ax− + = ( )x a+ 2 = | x + a | 11.1.4 Ellipse An ellipse is the set of points in a plane, the sum of whose distances
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