func_code_string: #include <bits/stdc++.h>   using namespace std;   mt19937 rng_32(chrono::steady_clock::now().time_since_epoch().count());   const int maxn = 2e5 + 10;   const double pi = acos(-1);   int main() {     int cas;     cin >> cas;     double n;     while (cas--) {       cin >> n;       printf( %.10lf n , cos(pi / 4.0 / n) / sin(pi / 2.0 / n));     }     return 0;   }   