# Python – cmath.atanh() function

• Last Updated : 28 May, 2020

cMath module contains a number of functions which is used for mathematical operations for complex numbers. The cmath.atanh() function returns the inverse hyperbolic arctangent value of a complex number. The value passed in this function can be int, float, and complex numbers.

Syntax: cmath.atanh(x)

Parameter:This method accepts only single parameters.

• x :This parameter is the value to be passed to atanh()

Returns:This function returns the inverse hyperbolic arctangent value of a  complex number.

Below examples illustrate the use of above function:

Example #1 : In this example we can see that by using cmath.atanh() method, we are able to get the values of inverse hyperbolic arctangent by passing any value to it.

## Python3

 `# Python code to implement``# the atanh()function``       ` `# importing "cmath"``# for mathematical operations  ``import` `cmath ``   ` `# using cmath.atanh() method ``val ``=` `cmath.atanh(``3``) ``   ` `print``(val)`

Output:

```(0.34657359027997264+1.5707963267948966j)
```

Example 2:

## Python3

 `# Python code to implement``# the atanh()function``       ` `# importing "cmath"``# for mathematical operations  ``import` `cmath ``   ` `# using cmath.atanh() method ``val ``=` `cmath.atanh(``2` `+` `5j``) ``   ` `print``(val)`

Output:

```(0.06706599664866984+1.399284356584545j)
```
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