Обсуждение:Универсальная тригонометрическая подстановка

Can someone help me find the origin of the name Универсальная тригонометрическая подстановка ("Universal trigonometric substitution")?

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Hi friendly Russian-speaking Wikipedians. I’m trying to research the history of this substitution, but I don’t read Russian. Can anyone help me hunt through old Russian math books to figure out where the name "Универсальная тригонометрическая подстановка" was first used? It seems like this name is well established in Russian books (when translated into English, "Universal trigonometric substitution"). Thanks for any help!

A couple examples of Russian sources translated into English:

Jacobolus (обс.) 19:42, 27 июля 2022 (UTC)Ответить