func_code_string: #include <bits/stdc++.h>   using namespace std;   const double eps = 0.5;   const double pi = acos(-1.0);   const long long INF = 2e18;   const int maxn = 100005;   int main() {     int t;     scanf( %d , &t);     while (t--) {       int n;       scanf( %d , &n);       n = n + n;       double ans = cos(pi / (2.0 * n)) / (sin(pi / (1.0 * n)));       printf( %.10f n , ans);     }     return 0;   }   