CACOS(3P) POSIX Programmer's Manual CACOS(3P)NAME
cacos, cacosf - complex arc cosine functions
double complex cacos(double complex z);
float complex cacosf(float complex z);
These functions compute the complex arc cosine of z, with branch cuts
outside the interval [-1, +1] along the real axis.
These functions return the complex arc cosine value, in the range of a
strip mathematically unbounded along the imaginary axis and in the
interval [0, pi] along the real axis.
No errors are defined.
The following sections are informative.
SEE ALSOccos(), the Base Definitions volume of IEEE Std 1003.1-2001, <com‐
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 CACOS(3P)