   #PHP Manual Mathematical Functions acos asin

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                                     acosh

   (PHP 4 >= 4.1.0)
   acosh -- Inverse hyperbolic cosine

Description

   float acosh ( float arg)

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

     Note: This function is not implemented on Windows platforms.

   See also acos(), asinh() and atanh().
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