   #PHP Manual Mathematical Functions atan base_convert

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                                     atanh

   (PHP 4 >= 4.1.0)
   atanh -- Inverse hyperbolic tangent

Description

   float atanh ( float arg)

   Returns the inverse hyperbolic tangent of arg, i.e. the value whose
   hyperbolic tangent is arg.

     Note: This function is not implemented on Windows platforms.

   See also atan(), asinh() and acosh().
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