---
title: "COS (Transact-SQL) | Microsoft Docs"
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ms.date: "07/24/2017"
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  - "COS"
  - "COS_TSQL"
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  - "TSQL"
helpviewer_keywords: 
  - "cosine"
  - "COS function"
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---
# COS (Transact-SQL)
[!INCLUDE[tsql-appliesto-ss2008-all_md](../../includes/tsql-appliesto-ss2008-all-md.md)]

Is a mathematical function that returns the trigonometric cosine of the specified angle, in radians, in the specified expression.
  
![Topic link icon](../../database-engine/configure-windows/media/topic-link.gif "Topic link icon") [Transact-SQL Syntax Conventions](../../t-sql/language-elements/transact-sql-syntax-conventions-transact-sql.md)
  
## Syntax  
  
```sql
-- Syntax for SQL Server, Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse  
  
COS ( float_expression )  
```  
  
## Arguments  
*float_expression*  
Is an [expression](../../t-sql/language-elements/expressions-transact-sql.md) of type **float**.
  
## Return types
**float**
  
## Examples  
The following example returns the COS of the specific angle.
  
```sql
DECLARE @angle float;  
SET @angle = 14.78;  
SELECT 'The COS of the angle is: ' + CONVERT(varchar,COS(@angle));  
GO  
```  
  
[!INCLUDE[ssResult](../../includes/ssresult-md.md)]
  
```sql
The COS of the angle is: -0.599465                        
  
(1 row(s) affected)  
```  

## Examples
  
[!INCLUDE[ssSDWfull](../../includes/sssdwfull-md.md)] and [!INCLUDE[ssPDW](../../includes/sspdw-md.md)]  


The following example returns the COS of the specific angle.
  
```sql
SELECT COS(14.76) AS cosCalc1, COS(-0.1472738) AS cosCalc2;   
```  
  
[!INCLUDE[ssResult](../../includes/ssresult-md.md)]
  
`cosCalc1  cosCalc2`
  
`--------  --------`
  
`-0.58     0.99`
  
## See also
[Mathematical Functions (Transact-SQL)](../../t-sql/functions/mathematical-functions-transact-sql.md)