.\"	$OpenBSD: csin.3,v 1.2 2013/06/05 03:40:26 tedu Exp $
.\"
.\" Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
.\"
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.Dd $Mdocdate: June 5 2013 $
.Dt CSIN 3
.Os
.Sh NAME
.Nm csin ,
.Nm csinf ,
.Nm csinl
.Nd complex circular sine
.Sh SYNOPSIS
.In complex.h
.Ft double complex
.Fn csin "double complex z"
.Ft float complex
.Fn csinf "float complex z"
.Ft long double complex
.Fn csinl "long double complex z"
.Sh DESCRIPTION
The
.Fn csin ,
.Fn csinf
and
.Fn csinl
functions compute the complex circular sine of
.Fa z .
.Pp
If
.Fa z
= x + iy, then
.Bd -literal -offset indent
csin(z) = sin(x) cosh(y) + i cos(x) sinh(y).
.Ed
.Sh RETURN VALUES
The
.Fn csin ,
.Fn csinf
and
.Fn csinl
functions return the complex circular sine of
.Fa z .
.Sh SEE ALSO
.Xr ccos 3 ,
.Xr ctan 3
.Sh STANDARDS
The
.Fn csin ,
.Fn csinf
and
.Fn csinl
functions conform to
.St -isoC-99 .