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<html> <head> <title>casinf</title> <META NAME="KEYWORDS" CONTENT="casinf"> </head> <body BGCOLOR="#ffffff" LINK="#0000ff" VLINK="#0000ff" ALINK="#0000ff" TEXT="#000000"> <center> <h1><b>casinf</b></h1></center> <PRE> <STRONG><A HREF="/man3/CASIN">CASIN(3)</A></STRONG> Linux Programmer's Manual <STRONG><A HREF="/man3/CASIN">CASIN(3)</A></STRONG> 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 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 at- <STRONG><A HREF="/man7/tributes">tributes(7)</A></STRONG>. +-----------------------------+---------------+---------+ |Interface | Attribute | Value | +-----------------------------+---------------+---------+ |casin(), casinf(), casinl() | Thread safety | MT-Safe | +-----------------------------+---------------+---------+ CONFORMING TO C99, POSIX.1-2001, POSIX.1-2008. SEE ALSO <STRONG><A HREF="/man3/clog">clog(3)</A></STRONG>, <STRONG><A HREF="/man3/csin">csin(3)</A></STRONG>, <STRONG><A HREF="/man7/complex">complex(7)</A></STRONG> COLOPHON This page is part of release 5.05 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2015-04-19 <STRONG><A HREF="/man3/CASIN">CASIN(3)</A></STRONG></PRE> <center> <h6>Man Pages Copyright Respective Owners. Site Copyright (C) 1994 - 2025 <a href="http://www.he.net">Hurricane Electric</a>. All Rights Reserved.</h6></center> </body> </html>