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你說的書上內容指的就是@霧光之森所貼的圖片嗎?如果是的話,那麼上面有個錯誤:在積分中值定理那裡,不應該有極限號!書上的意思是說ξ_n是個隨n變換的量,並非是介於0到1之間的【常數】.如果ξ_n是隨著n趨於π/2的話…
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