#include <cmath>

double cos (double x) 

Liefert den Kosinus von x.

Rückgabewert: cos(x).

acos(), cosh(), sin(), tan().

cos.cpp

#include <cmath>
#include <iostream>
#include <iomanip>
 
int main()
{
  const auto pi = std::acos(-1.0);
  std::cout << "#      x cos(x)\n";	
 
  for (auto x : {0.0, pi/6, pi/4, pi/3, pi/2})
  {
    std::cout << std::setw(8) << x << " " << std::cos(x) << '\n';
  }
}