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

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Text this: On the solution of a class of function equation in plane geometry