math library functions: pow, fmod, sin, cos, tan : Math « Development « C++ Tutorial

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#include <iostream>
using std::cout;
using std::endl;
using std::fixed;

#include <iomanip>
using std::setprecision;

#include <cmath>
using namespace std; 

int main()
{
   cout << fixed << setprecision( 1 ); 

   cout << "\npow(" << 2.0 << ", " << 7.0 << ") = " << pow( 2.0, 7.0 ) << "\npow(" << 9.0 << ", " 
      << 0.5 << ") = " << pow( 9.0, 0.5 );
   cout << setprecision(3) << "\nfmod("<< 13.675 << ", " << 2.333 << ") = "           << fmod( 13.675, 2.333 ) << setprecision( 1 ); 
   cout << "\nsin(" << 0.0 << ") = " << sin( 0.0 ); 
   cout << "\ncos(" << 0.0 << ") = " << cos( 0.0 );
   cout << "\ntan(" << 0.0 << ") = " << tan( 0.0 ) << endl;
   return 0;
}

pow(2.0, 7.0) = 128.0
pow(9.0, 0.5) = 3.0
fmod(13.675, 2.333) = 2.010
sin(0.0) = 0.0
cos(0.0) = 1.0
tan(0.0) = 0.0