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Tangents of a cubic

Author:
Marcelo Oliveira Violato
Topic:
Geometry
This file helps to understand the lecture 6 - DiffGeom - from Prof. Wildberger. (https://www.youtube.com/watch?v=SSacdJZXCXc&index=30&list=PLIljB45xT85DWUiFYYGqJVtfnkUFWkKtP) When we change the Level variable, we can observe changes of curves of level. When we change the point A, we can observe changes of tangent surfaces - plane and quadric.

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