標籤: integrate

來解看看, 用 wolframalpha:

https://diary.tw/s/intwifi

結果答案是…. 3.141592653589…..

繼續閱讀:
https://news.tvbs.com.tw/fun/989791
https://gotv.ctitv.com.tw/2017/03/435561.htm
https://www.newmobilelife.com/2016/11/01/the-most-difficult-wifi-password-in-the-world/