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

       The  casin()  function  calculates  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.

CONFORMING TO

       C99.

SEE ALSO

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

COLOPHON

       This page is part of release 3.54 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/.

                                            2008-08-11                                   CASIN(3)