xref: /freebsd/lib/msun/man/cos.3 (revision d2034aedc1d28ea7495b2ee3f7dcc946ef5fb308)

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.\"     from: @(#)cos.3	5.1 (Berkeley) 5/2/91
.\" $FreeBSD$
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.Dd April 1, 2020
.Dt COS 3
.Os
.Sh NAME
.Nm cos ,
.Nm cosf ,
.Nm cosl
.Nd cosine functions
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft double
.Fn cos "double x"
.Ft float
.Fn cosf "float x"
.Ft long double
.Fn cosl "long double x"
.Sh DESCRIPTION
The
.Fn cos ,
.Fn cosf ,
and
.Fn cosl
functions compute the cosine of
.Fa x
(measured in radians).
A large magnitude argument may yield a result with little or no
significance.
For a discussion of error due to roundoff, see
.Xr math 3 .
.Sh RETURN VALUES
The
.Fn cos ,
.Fn cosf ,
and
.Fn cosl
functions return the cosine value.
.Sh SEE ALSO
.Xr acos 3 ,
.Xr asin 3 ,
.Xr atan 3 ,
.Xr atan2 3 ,
.Xr ccos 3 ,
.Xr cosh 3 ,
.Xr math 3 ,
.Xr sin 3 ,
.Xr sinh 3 ,
.Xr tan 3 ,
.Xr tanh 3
.Sh STANDARDS
These functions conform to
.St -isoC-99 .
.Sh HISTORY
The
.Fn cos
function first appeared in
.At v1 .