   #PHP Manual Mathematical Functions asin atan2

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                                     asinh

   (PHP 4 >= 4.1.0)
   asinh -- Inverse hyperbolic sine

Description

   float asinh ( float arg)

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

     Note: This function is not implemented on Windows platforms.

   See also asin(), acosh() and atanh().
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