func_code_string: #include <bits/stdc++.h>   using namespace std;   const double PI = 3.14159265358979323846264338327950288419716939937510582;   int t;   int n;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     cin >> t;     while (t--) {       cin >> n;       cout << fixed << setprecision(20) << cos(PI / (4 * n)) / sin(PI / (2 * n))            <<   n ;     }     return 0;   }   