If you're fed up with going to Insert > Symbol every three seconds in Microsoft Word, here is an essential trick that will simplify your life.

Begin by writing down all the mathematical symbols that you plan to use. Unfortunately, this will involve going to Insert > Symbol a bunch of times -- but just this once. For example, you might write down:

Now here's the trick. Select the first symbol on your list (in my case, δ). Go to Tools > AutoCorrect Options. In the "Replace" box, enter a code that you'll be able to remember represents your symbol. I usually prefix the name of the symbol with a frontslash; so in this example, I'll enter \delta into that box. The δ symbol itself should automatically appear in the "With" box on the right. Make sure the "Formatted Text" dial is selected if you want to preserve the italics and other formatting you used. Click ok.

That's it! Whenever you enter \delta into Microsoft word, it will automatically be replaced by δ. Now, just repeat this process for each of the symbols you wrote down, and you will have permanently entered these headache-relieving codes into Word's autocorrect database. So when I write down

what appears is

The trick works for longer expressions too. For example, if I selected the expression above and go to Tools > Autocorrect Options, I can enter \LimitImp into the "Replace" box. Now, whenever I type

what appears is

Happy calculating!