docs: public float disc(float[] x, int A, float alpha, float beta) {
      float tmp;
      tmp = (float) Math.cos((float) A * Math.pow(x[0], beta) * Math.PI);
  
      return (float) 1.0 - (float) Math.pow(x[0], alpha) * (float) Math.pow(tmp, 2.0);
    }