asin, asinf, asinl – arc sine function

USAGE
       #include <math.h>

       double asin(double x);
       float asinf(float x);
       long double asinl(long double x);

       Link with -lm.

DESCRIPTION
       The  asin()  function  calculates  the arc sine of x; that is the value
       whose sine is x.  If x falls outside the range -1 to  1,  asin()  fails
       and errno is set.

RETURN VALUE
       The  asin()  function  returns the arc sine in radians and the value is
       mathematically defined to be between -PI/2 and PI/2 (inclusive).

ERRORS
       EDOM   x is out of range.

CONFORMING TO
       SVr4, POSIX.1-2001, 4.3BSD, C89.  The float and  long  double  variants
       are C99 requirements.

SEE ALSO
       acos(3), casin(3), atan(3), atan2(3), cos(3), sin(3), tan(3)