Director circle of an ellipse (x²+y²=a²−b² (a>b) locus of intersection of perpendicular tangents)
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x²+y²=a²−b² (a>b) locus of intersection of perpendicular tangents
What each symbol means
| Symbol | What it stands for |
|---|---|
| a,b | Semi axes |
When to use this
Requires a>b so a²−b²>0; else no real director circle in this form.