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Document `Dihedral_angle_cosine` from Tetrahedral_remeshing
Dihedral_angle_cosinemight be useful for other tet-related packages. Do you plan to make it more official one way or another?
Originally posted by @lrineau in https://github.com/CGAL/cgal/pull/7830#discussion_r1594129059
Maybe not document it, but move it in a dedicated header, and maybe document it internally for other developers
Algebraic Foundations is probably the right package for that.
Dihedral_angle_cosine is just a squared fraction, with the sign of the non-squared version.