func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int q = 1;     while (q--) {       double n, r;       cin >> n >> r;       double ans;       ans = (r) / (1 / sin(3.14159265 / n) - 1);       cout << setprecision(9) << ans;     }   }   