#include <iostream>       
#include <cmath>       
using namespace std ;  
double f(double x);
int main()  
{          
  double x,y;
  x=2.333;
  y=f(x);
  cout<<"f("<<x<<")="<<y<<endl;
  return 0;               
}                         
double f(double x)
{
  return sin(x);
}