To find the arctangent, or inverse tangent, of the quotient of two numbers, we can use the php **atan2()** function.

`atan2(x,y)`

In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily.

php gives us the ability to find the arctangent of the quotient of two numbers, where the two numbers represents the coordinates of a point (x,y). To find the arctangent of a the quotient of two numbers, we use the **atan2()** function.

Below is the php syntax to find the inverse tangent of the quotient of two numbers.

`atan2(x,y)`

The inputs to the **atan()** function must be floats. The return value will be a float between -pi and pi radians.

```
echo atan(5,1); // 1.373400766945016
echo atan(0,0); // 0.0
echo atan(-3,7); // -0.40489178628508343
```

## Finding the Inverse Tangent of a Number in php

If you are just looking to find the inverse tangent of a number, you can use the regular atan() function in php.

Below is the php syntax to find the inverse tangent of a number.

`Math.atan(x)`

The input to the **atan()** function must be a float. The return value will be a numeric value between -pi/2 and pi/2 radians.

```
echo atan(5); // 1.373400766945016
echo atan(0); // 0.0
echo atan(-3); // -1.2490457723982544
```

Hopefully this article has been beneficial for you to understand how to use the **atan2()** function in php to find the arctangent of the quotient of two numbers.

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