code: def haversine(theta: float) -> float:
      """
      Compute haversine
  
      Parameters
      ----------
  
      theta : float
          angle (radians)
  
      Results
      -------
  
      htheta : float
          haversine of `theta`
  
      https://en.wikipedia.org/wiki/Haversine
      Meeus p. 111
      """
      return (1 - cos(theta)) / 2.0
  
label_desc: Use image node_id 3 for calling a global function with example usage: haversine(theta) and returns: unknown