text: function In (v)
  {
      return v * v;
  }
  
  function Out (v)
  {
      return v * (2 - v);
  }
  
  function InOut (v)
  {
      if ((v *= 2) < 1)
      {
          return 0.5 * v * v;
      }
      else
      {
          return -0.5 * (--v * (v - 2) - 1);
      }
  }
  
  module.exports = {
  
      In: In,
      Out: Out,
      InOut: InOut
  
  };
  