If you use Word or OneNote, you know that there is an equation formatter and that MS Word supports LATEX, but did you know that there is a free add-in for Word and OneNote that does graphing and solves complex equations? And I mean complex in both the imaginary number system as well as complicated equations.
http://www.microsoft.com/download/en/confirmation.aspx?id=17786 (this is the download)
If you are have access to Dreamspark Premier you can get OneNote at no cost to you or your school.
When you have the Math Add-in installed and you will see the Mathematics add-in on OneNote, this is similar to the use of Word.
Once you write the equation using the Equation editor, you plot both sides (with a simple equation) and here you go: