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JEE Advanced Mathematics question

MathematicsEllipseJEE Advanced

If the tangents from the point to the ellipse are at right angles then is

Answer: (C)

Solution

Perpendicular tangents meet on the **director circle** . So .

*Book's route (pair of tangents).* The pair of tangents from is :

(+-1)(+Missing argument for \frac\frac94-1)=(Missing argument for \frac\frac{λ

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Question ID VK-109093