   #PHP Manual Mathematical Functions acosh asinh

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                                     asin

   (PHP 3, PHP 4 )
   asin -- Arc sine

Description

   float asin ( float arg)

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

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