func_code_string: #include <bits/stdc++.h>   using namespace std;   const double PI = 3.14159265;   int main() {     ios::sync_with_stdio(false);     int t;     cin >> t;     while (t--) {       int n;       cin >> n;       cout << fixed << setprecision(7) << (cos(PI / (4 * n)) / sin(PI / (2 * n)))            << endl;     }   }   