conic sections - A tangent to ellipse $E_1$ intersects ellipse $E_2$ at $P$ and $Q$. Prove that the tangents to $E_2$ at $P$ and $Q$ are perpendicular to each other. - Mathematics
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geometry - Proving the second statement regarding ellipse using the first one or without it - Mathematics Stack Exchange
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An elementary course of infinitesimal calculus . = 2a (6), we find cos^ = cos^ (7), or, the focal distances make equal angles with the curve onopposite sides. Ex. 2. To find
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