xref: /openbsd-src/lib/libm/man/cos.3 (revision 83348857057bb4d7e8af1e261e2c940878592523)

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.\"     from: @(#)cos.3	5.1 (Berkeley) 5/2/91
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.Dd $Mdocdate: September 6 2019 $
.Dt COS 3
.Os
.Sh NAME
.Nm cos ,
.Nm cosf ,
.Nm cosl
.Nd cosine functions
.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
function computes the cosine of
.Fa x
(measured in radians).
The
.Fn cosf
function is a single precision version of
.Fn cos .
The
.Fn cosl
function is an extended precision version of
.Fn cos .
A large magnitude argument may yield a result with little or no
significance.
.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 cosh 3 ,
.Xr sin 3 ,
.Xr sinh 3 ,
.Xr tan 3 ,
.Xr tanh 3
.Sh STANDARDS
The
.Fn cos
function conforms to
.St -ansiC .
.Sh HISTORY
A
.Fn cos
function first appeared in
.At v1 .