Supernotes uses LaTeX languages to render maths equations instantly. For inline maths equations you can surround the LaTeX with a single dollar symbol,
$ . For example:
Or if you want to give your equation real emphasis, try creating an equation block, by surrounding the equation with two dollar symbols,
$$ , on a new line.
Supernotes helps you to write LaTeX by monospacing the font and syntax highlighting LaTeX when used as a block.
Don't know all the symbols? Search for them in this awesome latex guide.