分からない問題はここに書いてね445

[615 １３２人目の素数さん 2018/08/04(土) 15:56:12.93 ID:VblSSaDK]

Let f ： R → R be defined by setting f(x) = sin(x) if x is rational, and f(x) = 0 otherwise.
At what points is f continuous?