- TIBCO BusinessEvents®
- Standard
- Math

# Math.cos()

## Signature

`double cos (double a)`

## Domain

ACTION, CONDITION, QUERY

## Description

Returns the trigonometric cosine of an angle. Special cases:
If the argument is NaN or an infinity, then the result is NaN.
A result must be within 1 ulp of the correctly rounded result. Results must be semi-monotonic.

## Parameters

Name | Type | Description
--- | --- | ---
`a` | `double` | An angle, in radians.

## Returns

Type | Description
--- | ---
`double` | The cosine of the argument.

## Cautions

none