   #PHP Manual Mathematical Functions atan2 atanh

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                                     atan

   (PHP 3, PHP 4 )
   atan -- Arc tangent

Description

   float atan ( float arg)

   Returns the arc tangent of arg in radians. atan() is the complementary
   function of tan(), which means that a==tan(atan(a)) for every value of
   a that is within atan()'s range.

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