text: #include <iostream>
  #include <cmath>
  #include <iomanip>
  using namespace std;
  int main() {
      cout << fixed << setprecision(4);
      cout << cos(123.456) << endl;
      cout << sin(123.456) << endl;
      cout << tan(123.456) << endl;
      cout << acos(0.456) << endl;
      cout << asin(0.456) << endl;
      cout << atan(123.456) << endl;
      cout << atan2(123.456, 234.567) << endl;
      cout << cosh(0.456) << endl;
      cout << sinh(0.456) << endl;
      cout << tanh(123.456) << endl;
      cout << acosh(123.456) << endl;
      cout << asinh(123.456) << endl;
      cout << atanh(0.5) << endl;
      cout << exp(12.3) << endl;
      cout << log(123.456) << endl;
      cout << log10(123.456) << endl;
      cout << sqrt(123.456) << endl;
      cout << ceil(123.456) << endl;
      cout << floor(123.456) << endl;
      cout << fabs(123.456) << endl;
      cout << abs(123.456) << endl;
      return 0;
  }