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# Constants of Maths in Python

Math module is a standard in-built module in Python that can be used for performing the mathematical tasks. The math module has a set of methods and constants.

Note: For more information, refer to Math-library-functions

1. Python math.e constant: The math.e constant returns the Euler’s number: 2.71828182846.

Syntax: math.e

Returns: Return a float value, 2.71828182846, representing the mathematical constant e

Example:

 `# Import math Library ` `import` `math ` ` `  `# Print the value of Euler e ` `print` `(math.e) `

Output:

```2.718281828459045
```

2. Python math.pi constant: The math.pi constant returns the value pi: 3.14159265359. It is defined as the ratio of the circumference to the diameter of a circle.

Syntax: math.pi

Returns: A float value, 3.14159265359, representing the mathematical constant PI

Example:

 `# Import math Library ` `import` `math ` ` `  `# Print the value of pi ` `print` `(math.pi) `

Output:

```3.141592653589793
```

3. Python math.tau constant: The math.tau constant returns the value tau: 6.283185307179586. It is defined as the ratio of the circumference to the radius of a circle.

Syntax: math.tau

Returns: A float value, 6.283185307179586, representing the mathematical constant tau

Example:

 `# Import math Library ` `import` `math ` ` `  `# Print the value of tau ` `print` `(math.tau) `

Output:

```6.283185307179586
```

4. Python math.inf constant: The math.inf constant returns of positive infinity.
For negative infinity, use -math.inf.The inf constant is equivalent to float(“inf”).

Syntax: math.inf

Returns: A float value, returns the value of positive infinity.

Example:

 `# Import math Library ` `import` `math ` ` `  `# Print the positive infinity ` `print` `(math.inf) ` ` `  `# Print the negative infinity ` `print` `(``-``math.inf) `

Output:

```inf
-inf
```

5. Python math.nan constant: The math.nan constant returns a floating-point nan (Not a Number) value. This value is not a legal number.The nan constant is equivalent to float(“nan”).

Syntax: math.nan

Returns: A float value, nan (Not a Number)

Example:

 `# Import math Library ` `import` `math ` ` `  `# Print the value of nan ` `print` `(math.nan) `

Output:

```nan
```

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