Returns the arc sine of its argument.

    Format

      #include  <math.h>

      double asin  (double x);

      float asinf  (float x); (Integrity servers, Alpha)

      long double asinl  (long double x); (Integrity servers, Alpha)

      double asind  (double x); (Integrity servers, Alpha)

      float asindf  (float x); (Integrity servers, Alpha)

      long double asindl  (long double x);

                          (Integrity servers, Alpha)

1  –  Argument

 x

    A radian expressed as a real number in the domain [-1,1].

2  –  Description

    The asin functions compute the principal value of the arc sine of
    x in the range [-pi/2,pi/2] radians for x in the domain [-1,1].

    The asind functions compute the principal value of the arc sine
    of x in the range [-90,90] degrees for x in the domain [-1,1].

    When abs(x) is greater than 1.0, the value of asin(x) is 0, and
    errno is set to EDOM.