public class polynom_c implements funktion_i
{
  public float f( float x )
  {
    return x*x - x + 3.0f;
  }
  public float derivatan( float x )
  {
    return 2.0f*x - 1.0f;
  }
  public float anti_derivatan( float x )
  {
    return x*x*x/3.0f - x*x/2.0f + 3.0f*x;
  }
} // polynom_c