I found a mobile application ( titled MathSolver) at http://nextapps.mtnonline.com/app/mathsolver.32039 that solves Mathematical Equations like charm. It asks you for a mathematical equation and provides a step by step solution just the way a sound math teacher would solve it. And it works offline.

Since then I have been working on developing a similar application on my web site using PHP such that users will be able to enter inputs like x² instead of x^2 just the way MathSolver takes input from users.
Any guide will be appreciated.

Thank you.