# TAN() and COT() Function in SQL Server

• Last Updated : 06 Oct, 2020

1. TAN() Function :
The TAN() function returns the tangent of a number.

Syntax :

`TAN(number)`

Parameter : Required. A numeric value.
number : It is a numeric value.
Returns : It returns the float_expression of the tangent of a number.

Example-1 :
When the arguments holds a positive number.

`SELECT TAN(3.25);`

Output :

`0.10883402551332971`

Example-2 :
When the arguments holds a negative number.

`SELECT TAN(-3.25);`

Output :

`-0.10883402551332971`

Example-3 :
When the PI() function is the argument.

```SELECT TAN(PI());
OR
DECLARE @angle FLOAT;
SET @angle = PI();
SELECT 'The TAN of the angle is: ' + CONVERT(VARCHAR, TAN(@angle));
```

Output :

`The TAN of the angle is: -1.22465e-016`

Example-4 :
When the argument passing as a expressions.

`SELECT TAN(5.2 + 1.4);`

Output :

`0.32785800671313348`

2. COT() Function :
The COT() function returns the cotangent of a number.

Syntax :

`COT(number)`

Parameter : Required. A numeric value.
number : It is a numeric value.
Returns : It returns the cotangent of a number.

Example-1 :
When the arguments holds a positive number.

`SELECT COT(4);`

Output :

`0.86369115445061673`

Example-2 :
When the argument is a fractional component.

`SELECT COT(2.53);`

Output :

`-1.4259392442208509`

Example-3 :
When the argument is an expression.

`SELECT COT(3 + 1);`

Output :

`0.86369115445061673`

Example-4 :
When the PI() function is the argument.

```Select COT(PI());
OR
DECLARE @angle FLOAT;
SET @angle = PI();
SELECT 'The COT of the angle is: ' + CONVERT(VARCHAR, COT(@angle));```

Output :

`The COT of the angle is: -8.16562e+015`

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