Describir: Developing formula /

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