jot down Math Input Panel in start menu and bring up the result which it shows.
When you open it, a window will appear that says Write math here.
You may select any one of them as you want to write.

That expression will be added in your required document.
Below are some other Third party tools mentioned.
This is very useful tool for maths students
This tool/program has lots of functionality.

There is an option for input by entering through Keyboard or Ink(write by your hands/mouse).
It can solve equations for you.
Just enter any equation it will displays you the result for that equation.

So this tool provides you lots of features to write Math Expressions and use them in any other documents.
Fluid Math
This is another Math Expression tool.
But it is not free.

Its registration fee is $15.
Now have fun with this software in writing any Expressions or Formulas.
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source: www.itechtics.com