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casin(3) — Linux manual page

casin(3)                 Library Functions Manualcasin(3)

NAME        top

       casin, casinf, casinl - complex arc sine

LIBRARY        top

       Math library (libm,-lm)

SYNOPSIS        top

#include <complex.h>double complex casin(double complexz);float complex casinf(float complexz);long double complex casinl(long double complexz);

DESCRIPTION        top

       These functions calculate the complex arc sine ofz.  Ify = casin(z), thenz = csin(y).  The real part ofy is chosen in       the interval [-pi/2,pi/2].       One has:           casin(z) = -i clog(iz + csqrt(1 - z * z))

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │casin(),casinf(),casinl()          │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS        top

       C11, POSIX.1-2008.

HISTORY        top

       glibc 2.1.  C99, POSIX.1-2001.

SEE ALSO        top

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

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17casin(3)

Pages that refer to this page:asin(3), csin(3), complex(7)

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