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

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Text this: Quadratic transformations of copula density and probability density