#include <iostream>
#include <cmath>
using namespace std;

double laske(double (*f)(double)){
  double x=5.5;
  return f(x);
}
int main(){  
  cout << laske(sinh) <<endl;;  
  cout << laske(cos) <<endl;;  
  cout << laske(acos) <<endl;;  
  return 0;
}