public class sin_c implements funktion_i
{
  public float f( float x )
  {
    return (float)Math.sin(x);
  }
  public float derivatan( float x )
  {
    return (float)Math.cos(x);
  }
  public float anti_derivatan( float x )
  {
    return -(float)Math.cos(x);
  }
} // sin_c