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:Is it really the case that {{tmath|1=\textstyle \tfrac12\pi = \int_0^\infty dx/(1+x^2)}} wasn't known until 1840? That seems impossible to me. –[[user:jacobolus|jacobolus]] [[user_talk:jacobolus|(t)]] 18:05, 25 August 2024 (UTC)
::The text does not imply that. It says this was used as a ''definition'' of pi in 1841. [[User:Tito Omburo|Tito Omburo]] ([[User talk:Tito Omburo|talk]]) 18:47, 25 August 2024 (UTC)
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