# C++ Math atan()

The function computes the inverse tangent of a number given in radian.

atan(x) = tan-1x

## Syntax

Suppose a number is 'x'. Syntax would be:

## Parameter

x: The value whose inverse tangent is to be calculated.

## Return value

It returns the value in the range[-∏/2, ∏/2].

## Example 1

Let's see a simple example when the value of x is zero.

Output:

```Value of tangent is :0
Inverse of tangent is :0
```

In this example, atan() function calculates the inverse tangent of a number when the value of x is equal to zero.

## Example 2

Let's see the simple example when the value of x is negative.

Output:

```Value of tangent is : -2.35197
Inverse of tangent is : -0.863063
```

In this example, atan() function calculates the inverse tangent of a number when the value of x is negative.

## Example 3

Let's see a simple example when the value of x is positive.

Output:

```Value of tangent is : 0.576996
Inverse of tangent is : 0.48214
```

In this example, atan() function calculates the inverse tangent of a number when the value of x is positive.

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