The file "Trigonometry.tex" is released under the Knuthian Licence, the current CTAN entry for which reads along the following lines (amendments to grammar and spelling made in the following text) -- "This software is copyright and you are explicitly granted a licence which allows you, the “user” of the software, to copy, distribute and/or modify the software, provided only that if you modify and then re-distribute the software it must be with a different name to that of the original software."
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