# Cos()

Calculates the cosine of an angle that is entered
in radians.
A number; the cosine of the angle.

```
Cos( number=number );
```

**Returns:** number

# Arguments

| Argument | Type | Required | Description | Default |
|----------|------|----------|-------------|---------|
| number | number | Yes | Angle, in radians, for which to calculate the cosine |  |

# Examples

The following code example will output an example number returned from the cos() function.

```cfml
    writeDump(cos(90));
```







# Categories

[Numbers](../../categories/number.md), [Math](../../categories/math.md)

# See Also

[numeric.cos()](../objects/numeric/cos.md)