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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 4.15 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)