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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 3.35 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://man7.org/linux/man-pages/.

                                  2008-08-11                          CASIN(3)