# Tan

The tangent function

`fun tan(radians)`

```
```

## Parameters

- radians: The angle of the function

## Discussion

The argument of `tan`

is assumed to be in radians. To use degrees or another unit, you can specify it with the value:

```
tan(0)
tan(pi/4)
tan(135 degrees)
```

```
0
1
-1
```

`tan`

is valid for all finite numbers except where `radians`

is an odd multiple of π/2