Hatta doesn't render mathematical formulas all by itself, instead it displays images from an external service, such as http://mathtran.org (the default), mimeTeX or mathTeX. You can use LaTeX-like syntax, enclosed in double dollar signs
$$. For example, you can write the famous Einstein–Pythagoras equation:
You can change the address of the service by setting the
math_url configuration variable in the Script settings.
There is a list of LaTeX rendering services.