.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\" Distributed under GPL
.\"
.TH CCOS 3 2008-08-11 "" "Linux Programmer's Manual"
.SH NAME
ccos, ccosf, ccosl \- complex cosine function
.SH SYNOPSIS
.B #include <complex.h>
.sp
.BI "double complex ccos(double complex " z ");"
.br
.BI "float complex ccosf(float complex " z ");"
.br
.BI "long double complex ccosl(long double complex " z ");"
.sp
Link with \fI\-lm\fP.
.SH DESCRIPTION
The complex cosine function is defined as:
.nf

    ccos(z) = (exp(i * z) + exp(\-i * z)) / 2
.fi
.SH VERSIONS
These functions first appeared in glibc in version 2.1.
.SH "CONFORMING TO"
C99.
.SH "SEE ALSO"
.BR cabs (3),
.BR csin (3),
.BR ctan (3),
.BR complex (7)
.SH COLOPHON
This page is part of release 3.22 of the Linux
.I man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
