This class can be use to render mathematical formulas as graphical images.
It parses a formula with constant and variable values combined with several possible mathematical operations.
Currently it supports formulates using the operations: addition, subtraction, multiplication, division, and functions like square root, sin arc sin, cosine, and power.
Then it renders the given formula in an GD library image. It uses a given True-Type font to render the formula characters.
The class returns a GD library image resource handle that can be used to output the formula image in any format supported by the GD library.