We take the family of ellipses with foci (a,0), (-a, 0) whose generic member we pass through the point (0,t). We look at the locus of the points of intersection of the tangent through the point (b,0).
The locus is clearly a circle. What is its center and radius?
Expressions
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| Point G Eq |  |
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| Locus Eq | |
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