# TAN

Returns the tangent value of a numeric expression

## Syntax

```TAN( expr )
```

## Arguments

Parameter

Description

`expr`

Numeric expression representing an angle in radians

## Returns

Always returns a floating point result of the tangent.

## Notes

• The result is in the range `[0, infinity)`.

• If the input value is NULL, the result is NULL.

## Examples

For these examples, consider the following table and contents:

```CREATE TABLE trig(f DOUBLE);

INSERT INTO trig VALUES (0), (PI()/12), (PI()/8), (PI()/6)
, (PI()/4), (PI()/3), (3*PI()/8), (5*PI()/12), (PI()/2);
```

### Tangent of π/4 (= 1)

Tip

```numbers=> SELECT TAN(PI()/4), TAN(RADIANS(45));
tan | tan0
----+-----
1 |    1
```

### Computing tangents for a column, in radians

```numbers=> SELECT f, TAN(f) FROM trig;
f      | tan
-------+------------------
0 |                 0
0.2618 |            0.2679
0.3927 |            0.4142
0.5236 |            0.5774
0.7854 |                 1
1.0472 |            1.7321
1.1781 |            2.4142
1.309 |            3.7321
1.5708 | 16331239353195370
```