C++ Math atan()

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

Syntax

Suppose a number is ‘x’. Syntax would be:

Note: If the value passed is an integer type, then it is cast to double.

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.