1️⃣2️⃣ Math 구독하기 👍 : http://bit.ly/3Pw2NOG 1️⃣2️⃣ Math 회원가입 👍👍 : http://bit.ly/3kiw8BM 3b1b 채널의 Wallis' formula : https://www.youtube.com/watch?v=8GPy_UMV-08