// Soln5_3.cpp
  include <iostream>
  include <cmath>
  using std::cout;
  using std::endl;
  using std::sin;
  using std::cos;
  using std::tan;
  
  const double DEG_TO_RAD = 57.2957795;
  
  double sind(double d)
  {
     return sin(d/DEG_TO_RAD);
  }
  
  double cosd(double d)
  {
     return cos(d/DEG_TO_RAD);
  }
  
  double tand(double d)
  {
     return tan(d/DEG_TO_RAD);
  }
  
  int main()
  {
     cout << "cos(30) = " << cosd(30.0) << endl;
     cout << "sin(30) = " << sind(30.0) << endl;
     cout << "tan(30) = " << tand(30.0) << endl;
  
     return 0;
  }