Is there any function for calculating angle between 2 line segments in 3D? - Mailing list pgsql-sql

From Shaozhong SHI
Subject Is there any function for calculating angle between 2 line segments in 3D?
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Msg-id CA+i5JwYSg0=TFHsnr+-BnKhU7J=rpgAMKqhLvPMp3kM28bvLzw@mail.gmail.com
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Regards,

David

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