casinl

       #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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       http://www.kernel.org/doc/man-pages/.

                                  2015-04-19                          CASIN(3)
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