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빛을 두 초점 밖으로 보낼 때의 타원의 포락선(The envelope of an ellipse when light is sent out of two foci)
Author:
민은기 (Min Eun Gi)
Topic:
Ellipse
GeoGebra
빛을 두 초점 밖으로 보낼 때의 타원의 포락선(The envelope of an ellipse when light is sent out of two foci)
https://min7014.github.io/math20200504001.html
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