---
title: "TAN (Transact-SQL)"
description: "TAN (Transact-SQL)"
author: MikeRayMSFT
ms.author: mikeray
ms.date: "03/03/2017"
ms.service: sql
ms.subservice: t-sql
ms.topic: reference
f1_keywords:
  - "TAN_TSQL"
  - "TAN"
helpviewer_keywords:
  - "TAN function"
  - "tangent"
dev_langs:
  - "TSQL"
monikerRange: ">= aps-pdw-2016 || = azuresqldb-current || = azure-sqldw-latest || >= sql-server-2016 || >= sql-server-linux-2017 || = azuresqldb-mi-current||=fabric"
---
# TAN (Transact-SQL)
[!INCLUDE [sql-asdb-asdbmi-asa-pdw-fabricse-fabricdw](../../includes/applies-to-version/sql-asdb-asdbmi-asa-pdw-fabricse-fabricdw.md)]

  Returns the tangent of the input expression.  
  
 :::image type="icon" source="../../includes/media/topic-link-icon.svg" border="false"::: [Transact-SQL syntax conventions](../../t-sql/language-elements/transact-sql-syntax-conventions-transact-sql.md)  
  
## Syntax  
  
```syntaxsql
TAN ( float_expression )  
```  
  
## Arguments
 *float_expression*  
 Is an [expression](../../t-sql/language-elements/expressions-transact-sql.md) of type **float** or of a type that can be implicitly converted to **float**, interpreted as number of radians.  
  
## Return Types  
 **float**  
  
## Examples  
 The following example returns the tangent of `PI()/2`.  
  
```sql
SELECT TAN(PI()/2);  
```  
  
 [!INCLUDE[ssResult](../../includes/ssresult-md.md)]  
  
```  
----------------------  
1.6331778728383844E+16  
```  
  
## Examples: [!INCLUDE[ssazuresynapse-md](../../includes/ssazuresynapse-md.md)] and [!INCLUDE[ssPDW](../../includes/sspdw-md.md)]  
 The following example returns the tangent of .45.  
  
```sql
SELECT TAN(.45);  
```  
  
 [!INCLUDE[ssResult](../../includes/ssresult-md.md)]  
  
 ```
--------  
0.48
```  
  
## See Also  
 [Mathematical Functions (Transact-SQL)](../../t-sql/functions/mathematical-functions-transact-sql.md)