Class 11

Math

Co-ordinate Geometry

Conic Sections

Let d be the perpendicular distance from the centre of the ellipse to any tangent to the ellipe. If $F_{1}andF_{2}$ are the two foci of the ellipse, then shown that $(PF_{1}−PF_{2})_{2}=4a_{2}$(1-$d_{2}b_{2} )$