Describir: A brief course in analytic geometry :

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