.\" 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 cacos (3),
.BR csin (3),
.BR ctan (3),
.BR complex (7)