Use math function: cos, sin, tan : Math « Development « C++ Tutorial

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

int main()
{
  double angle, dsine,dcos,dtan;

  cout << "Please enter an angle in radians \n";
  cin >> angle;

  dcos =cos(angle);
  dsine =sin(angle);
  dtan =tan(angle);

  cout << " Your angles trigonometric functions are \n";
  cout << " Sine is " << dsine << "\n";
  cout << " Cosine is " << dcos << "\n";
  cout << " Tangent is " << dtan << "\n";

  return 0;
}

Please enter an angle in radians
12
 Your angles trigonometric functions are
 Sine is -0.536573
 Cosine is 0.843854
 Tangent is -0.63586