.\"	$OpenBSD: ccos.3,v 1.1 2011/07/20 17:50:43 martynas Exp $
.\"
.\" Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
.\"
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.Dd $Mdocdate: July 20 2011 $
.Dt CCOS 3
.Os
.Sh NAME
.Nm ccos ,
.Nm ccosf ,
.Nm ccosl
.Nd complex circular cosine
.Sh SYNOPSIS
.Fd #include <complex.h>
.Ft double complex
.Fn ccos "double complex z"
.Ft float complex
.Fn ccosf "float complex z"
.Ft long double complex
.Fn ccosl "long double complex z"
.Sh DESCRIPTION
The
.Fn ccos ,
.Fn ccosf
and
.Fn ccosl
functions compute the complex circular cosine of
.Fa z .
.Pp
If
.Fa z
= x + iy, then
.Bd -literal -offset indent
ccos(z) = cos(x) cosh(y) - i sin(x) sinh(y).
.Ed
.Sh RETURN VALUES
The
.Fn ccos ,
.Fn ccosf
and
.Fn ccosl
functions return the complex circular cosine of
.Fa z .
.Sh SEE ALSO
.Xr csin 3 ,
.Xr ctan 3
.Sh STANDARDS
The
.Fn ccos ,
.Fn ccosf
and
.Fn ccosl
functions conform to
.St -isoC-99 .