# @Tan (Formula Language)

Given an angle in radians, returns the tangent of the angle. In a right triangle the tangent of an acute angle is the ratio of the length of the opposite side to the length of the adjacent side.

## Syntax

**@Tan( ** *angle * **)**

## Parameters

*angle*

Number or number list. Any angle, expressed in radians.

## Return value

*tangent*

Number
or number list. The tangent of *angle.*

## Usage

If the parameter is a list, the function operates on each element of the list, and the return value is a list with the same number of elements.

## Examples

- This example returns 1 (approximately).
`@Tan( @Pi/4 )`

- This example returns 1 and 1.7 (approximately) in a list.
`@Tan( (@Pi/4) : (@Pi/3) )`