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Condition for Two Tangents to Be Perpendicular
For the ellipse:
$$\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$$
the point of intersection of two perpendicular tangents lies on:
$$x^2+y^2=a^2+b^2$$
Usage
- Used to determine the locus of intersection points of perpendicular tangents.
