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  1. #include <iostream>
  2.  
  3. #define _USE_MATH_DEFINES
  4.  
  5. #include <cmath>
  6.  
  7. using namespace std;
  8.  
  9. int main() {
  10.     ios_base::sync_with_stdio(false);
  11.     cin.tie(0);
  12.     cout.tie(0);
  13.     cout.precision(17);
  14.     int t;
  15.     cin >> t;
  16.     while (t--) {
  17.         double n;
  18.         cin >> n;
  19.         cout << 1 / cos(M_PI / (2*n)) << endl;
  20.     }
  21. }
Success #stdin #stdout 0s 4508KB
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stdin
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3
3
5
199
stdout
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1.1547005383792515
1.0514622242382672
1.00003115407639
https://ideone.com/IUl0bS
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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