Word seems like an odd choice to use with mathematical equations, but the reality is Microsoft Word is a great choice. Word has a gallery of built-in equations, and you can enter your own ...

Math AutoCorrect, lets you control where to replace math terms with math symbols. Learn how to enable AutoCorrect for Math in Word.

It works by automatically detecting equations that have been digitally inked into a OneNote page, and allows you to circle the equation and get step-by-step instructions on how to solve it.