[discrete]
[[esql-cos]]
=== `COS`

*Syntax*

[.text-center]
image::esql/functions/signature/cos.svg[Embedded,opts=inline]

*Parameters*

`n`::
Numeric expression. If `null`, the function returns `null`.

*Description*

Returns the {wikipedia}/Sine_and_cosine[cosine] of `n`. Input expected in
radians.

*Supported types*

include::types/cos.asciidoc[]

*Example*

[source.merge.styled,esql]
----
include::{esql-specs}/floats.csv-spec[tag=cos]
----
[%header.monospaced.styled,format=dsv,separator=|]
|===
include::{esql-specs}/floats.csv-spec[tag=cos-result]
|===