MathTalk is a specialized speech recognition mathematics software which allows the user to voice any math (pre-algebra, algebra, trig, calculus, statistics, graphing, PhD and professional levels) and have it appear onscreen. Established in 1997, MathTalk is a vast library of voice commands used initially with DragonDictate and now with Dragon NaturallySpeaking. Prices range between $300 for student packages and $900 for bundled packages.
Below are three videos to help you understand how the software works with pre-algebra, graphing, and math to braille features (many other demos of features on the company product site).
The MathTalk web site is at http://www.mathtalk.com.
Math to Braille Demo: