# tan in R: How to Use tan() Function in R

In a right-angled triangle, the tangent of an angle is:

The length of the side opposite the angle is divided by the length of the adjacent side.

The abbreviation is tan is the following.

``tan(θ) = opposite / adjacent``

## tan in R

The tan() is a built-in R function that calculates the tangent value of numeric value. It accepts a numeric value as a parameter and returns the tangent value. The tanpi() method calculates the tangent of the input value, the multiples of π.

To calculate the tangent in R programming, use the tan() function.

### Syntax

``tan(x)``

### Parameters

The tan() function takes a numeric value.

### Example

``````x1 <- -45
x2 <- -60

tan(x1)
tan(x2)``````

#### Output

`````` -1.619775
 -0.3200404``````

## Applying pi to the tan() function

The pi is an inbuilt constant whose value is 3.141593. Let’s pass the pi to the tan() function and see the output.

``````x1 <- pi
x2 <- pi / 3

tan(x1)
tan(x2)``````

#### Output

`````` -1.224647e-16
 1.732051``````

## Applying a tan() function to Vector

To create a Vector in R, use the c() function. First, let’s create a vector and pass that vector to the tanpi() function.

``````dt <- c(1, 0.5, -1, -0.25, 0.5, 2 / 3)
tanpi(dt)``````

#### Output

`````` 0.000000  NaN  0.000000  -1.000000  NaN  -1.732051
Warning message:
In tanpi(dt) : NaNs produced``````

That is it for tan() function in R.