TAN (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
Returns the tangent of the input expression.
Transact-SQL syntax conventions
Syntax
TAN ( float_expression )
Note
To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation.
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 is 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 is the result set.
--------
0.48