CASIN(3)		   Linux Programmer's Manual		      CASIN(3)



NAME
       casin, casinf, casinl - complex arc sine

SYNOPSIS
       #include <complex.h>

       double complex casin(double complex z);
       float complex casinf(float complex z);
       long double complex casinl(long double complex z);

       Link with -lm.

DESCRIPTION
       These  functions calculate the complex arc sine of z.  If y = casin(z),
       then z = csin(y).  The real  part  of  y	 is  chosen  in	 the  interval
       [-pi/2,pi/2].

       One has:

	   casin(z) = -i clog(iz + csqrt(1 - z * z))

VERSIONS
       These functions first appeared in glibc in version 2.1.

ATTRIBUTES
       For   an	  explanation	of   the  terms	 used  in  this	 section,  see
       attributes(7).

       +-----------------------------+---------------+---------+
       |Interface		     | Attribute     | Value   |
       +-----------------------------+---------------+---------+
       |casin(), casinf(), casinl()  | Thread safety | MT-Safe |
       +-----------------------------+---------------+---------+
CONFORMING TO
       C99, POSIX.1-2001, POSIX.1-2008.

SEE ALSO
       clog(3), csin(3), complex(7)

COLOPHON
       This page is part of release 4.10 of the Linux  man-pages  project.   A
       description  of	the project, information about reporting bugs, and the
       latest	 version    of	  this	  page,	   can	   be	  found	    at
       https://www.kernel.org/doc/man-pages/.



				  2015-04-19			      CASIN(3)