# Tan()

Today, we will discuss the `tan()` function in PHP. This function is used to calculate the tangent of an angle.

## What is the tan() Function?

The `tan()` function in PHP is a built-in function that is used to calculate the tangent of an angle. The tangent of an angle is defined as the ratio of the length of the side opposite the angle to the length of the side adjacent to the angle in a right-angled triangle. The `tan()` function takes an angle in radians as its argument and returns the tangent of that angle.

## How to Use the tan() Function

Using the `tan()` function in PHP is very simple. Here is an example of how to use the function:

``````<?php
// Calculate the tangent of an angle using the tan() function
\$result = tan(pi() / 4);

// Output the result
echo \$result;
?>``````

In this example, we call the `tan()` function to calculate the tangent of the angle pi/4 (45 degrees) in radians. We then store the result in a variable and output it to the screen.

## Conclusion

The `tan()` function in PHP is a useful tool for any PHP developer working with trigonometric calculations involving tangent. By using this function, you can easily calculate the tangent of an angle, which can be useful in a variety of applications. We hope that this guide has been helpful in understanding how to use the `tan()` function in your PHP code.