✨ Best Answer ✨
しっかりと計算したいのであれば、置換しないといけませんが、下の式を公式として覚えれば1発です！
https://w3e.kanazawa-it.ac.jp/math/category/sekibun/basic-int/henkan-tex.cgi?target=/math/category/sekibun/basic-int/int-sonota_2.html
Answers
Were you able to resolve your confusion?
Users viewing this question
are also looking at these questions 😉
助かりました！ありがとうございます！