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CASIN(3)                      Linux Programmer's Manual                      CASIN(3)

NAME         top

       casin, casinf, casinl - complex arc sine

SYNOPSIS         top

       #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         top

       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         top

       These functions first appeared in glibc in version 2.1.

CONFORMING TO         top

       C99.

SEE ALSO         top

       ccos(3), clog(3), complex(7)

COLOPHON         top

       This page is part of release 3.32 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)

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