// C++ code to demonstrate the example of
// trigonometric functions
#include <iostream>
#include <cmath>
using namespace std;
// main() section
int main()
{
float x;
float y;
x = 0.25;
cout<<"cos("<<x<<") : "<<cos (x)<<endl;
cout<<"sin("<<x<<") : "<<sin (x)<<endl;
cout<<"tan("<<x<<") : "<<tan (x)<<endl;
cout<<"acos("<<x<<"): "<<acos(x)<<endl;
cout<<"asin("<<x<<"): "<<asin(x)<<endl;
cout<<"atan("<<x<<"): "<<atan(x)<<endl;
y = 1.0;
cout<<"atan2("<<y<<","<<x<<"): "<<atan2(y,x)<<endl;
return 0;
}