ASIN(3) 		   Linux Programmers Manual		      ASIN(3)



NAME
       asin, asinf, asinl - arc sine function

SYNOPSIS
       #include 

       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, C99.  The float and long double  vari
       ants are C99 requirements.

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

COLOPHON
       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



				  2002-07-25			       ASIN(3)