TAN (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
SQL analytics endpoint in Microsoft Fabric
Warehouse in Microsoft Fabric
Returns the tangent of the input expression.
Transact-SQL syntax conventions
Syntax
TAN ( float_expression )
Arguments
float_expression
Is an expression 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.
SELECT TAN(PI()/2);
Here's the result set.
----------------------
1.6331778728383844E+16
Examples: Azure Synapse Analytics and Analytics Platform System (PDW)
The following example returns the tangent of .45.
SELECT TAN(.45);
Here's the result set.
--------
0.48