أرسل هذا في رسالة قصيرة: A unified method of teaching conic sections

   _____   _    _     _  _    _    _    _    _   
  / ___// | || | ||  | \| || | || | || | || | || 
  \___ \\ | || | ||  |  ' || | || | || | || | || 
  /    // | \\_/ ||  | .  || | \\_/ || | \\_/ || 
 /____//   \____//   |_|\_||  \____//   \____//  
`-----`     `---`    `-` -`    `---`     `---`