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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

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     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.

                                2015-04-19                          CASIN(3)