.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\"
.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
.\" Distributed under GPL
.\" %%%LICENSE_END
.\"
.TH CCOS 3 2021-03-22 "" "Linux Programmer's Manual"
.SH NAME
ccos, ccosf, ccosl \- complex cosine function
.SH SYNOPSIS
.nf
.B #include <complex.h>
.PP
.BI "double complex ccos(double complex " z ");"
.BI "float complex ccosf(float complex " z ");"
.BI "long double complex ccosl(long double complex " z ");"
.PP
Link with \fI\-lm\fP.
.fi
.SH DESCRIPTION
These functions calculate the complex cosine of
.IR z .
.PP
The complex cosine function is defined as:
.PP
.nf
    ccos(z) = (exp(i * z) + exp(\-i * z)) / 2
.fi
.SH VERSIONS
These functions first appeared in glibc in version 2.1.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.ad l
.nh
.TS
allbox;
lbx lb lb
l l l.
Interface	Attribute	Value
T{
.BR ccos (),
.BR ccosf (),
.BR ccosl ()
T}	Thread safety	MT-Safe
.TE
.hy
.ad
.sp 1
.SH CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
.SH SEE ALSO
.BR cabs (3),
.BR cacos (3),
.BR csin (3),
.BR ctan (3),
.BR complex (7)