--- Concepts ## Using `math` Functions [![view video](https://iajupyterprodblobs.blob.core.windows.net/imagecontainer/common/play_video.png)](http://edxinteractivepage.blob.core.windows.net/edxpages/f7cff1a7-5601-48a1-95a6-fd1fdfabd20e.html?details=[{"src":"http://jupyternootbookwams.streaming.mediaservices.windows.net/bc5c9d63-316c-4cef-861b-441f6f7693d5/DEV330x-1_1b_use_math_functions.ism/manifest","type":"application/vnd.ms-sstr+xml"}],[{"src":"http://jupyternootbookwams.streaming.mediaservices.windows.net/53d6d81c-35b3-438d-9ab3-c3da5b17049e/DEV330x-1_1b_use_math_functions.vtt","srclang":"en","kind":"subtitles","label":"english"}]) The Python Documentation Site's page on [math](https://docs.python.org/3.6/library/math.html) module contains a lot of mathematically useful functions and constants. For example, it contains trigonometric functions such as `cos` and `sin`, and other functions such as `sqrt`. ### Square root The `sqrt` function computes the square root of a number. The following examples show how to compute: * √5 * √30 ```python from math import sqrt #compute the square root of 5 sqrt(5) #compute the square root of 30 sqrt(30) ``` ### Other arithmetic operators #### Division operator `/` Normal division is performed by the `/` operator. For example: ⁵/₂ = 2 ¹/₂ = 2.5 ```python In [1]: 5/2 Out[1]: 2.5 ``` #### Integer division operator `//` We can keep the integer and discard the fractional remainder by using the integer division operator `//`. ```python In [1]: 5//2 Out[1]: 2 ``` #### Modulo operator `%` The modulo operator is opposite to the integer division operator; it keeps the remainder of a division. ```python In [1]: 5%2 Out[1]: 1 ``` #### Exponent operator `**` We saw earlier that the `pow` function from the `math` module computes the exponent. We can achieve the same functionality using the exponent `**` operator. To compute 2³ and 5²: ```python In [1]: 2**3 Out[1]: 8 In [2]: 5**2 Out[2]: 25 ```