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If you have a look at the documentation of these function in MSDN it seems that this article is basically gathered by copying from individual explanations in MSDN: Mathematical Functions (Transact-SQL)[^]
I checked several functions and, for the post part, it is only a direct copy/paste of the MSDN documentation, with some minor arrangements.
But this does not bring any added value to the core documentation.
In my opinion, it can be also the advertisement of something which could be a control substance, or just cheating dangerous for people help. Playing with such chemistry (brain boosters!) on one's own is extremely dangerous, as well as extensive ordering on free market and making money on it. I think this is a big social problem.