You can author using LaTeX in the Atomic Assessments Question Equation editor by clicking on it and clicking the View Code button.
Another option is to convert LaTeX to HTML. View the source for a question, copy and paste the HTML into the question source, switch back to the rich text to verify it looks good, and then save it.
There are a variety of ways to generate HTML from LaTeX. One good way is using pandoc. Here are some explanations:
https://github.com/kylehovey/latex-learnosity-conversion
https://tex.stackexchange.com/questions/39309/convert-latex-to-html
Inserting LaTeX Into A Question Using The Rich Text Toolbar's
Our Math Editor allows you the author to input Math symbols in any Question that contains rich text fields. This means you can mix questions like Multiple Choice and any of our drag and drop options with math symbols, expanding the kinds of math questions you can ask.
The Math Editor can be found in any field that contains the rich text toolbar, and is denoted by the uppercase sigma symbol:
Figure 1: The Rich Text Toolbar in the Compose Question field of an MCQ.
By default, the math markup language used by the Math Editor is set to LaTeX. You will see several options available in the Editor:
Figure 2: The Math Editor pop-up.
Math Keypad
Enter math symbols using the keypad. Select from the drop-down menu on the top left to navigate between our different available symbols groups.
Figure 3: The LaTeX symbols drop-down menu in the math keypad.
ARIA Label
This will auto-generate as you enter symbols using the keypad, but you can modify the auto-generated label to whatever you want by typing directly inside the ARIA label field.
Figure 4: The ARIA Label field in the Math Editor, which can be easily modified.
Display
Underneath the ARIA Label field, you can choose between Inline or Block display.
Inline is the default setting and allows you to insert text on the same line as the LaTeX in the rich text field, e.g.
Figure 5: Inline LaTeX style
While the Block style places the LaTeX expression on a new line.
Figure 6: Block LaTeX style
Source
Clicking View Source will show you the raw LaTeX markup, alongside the ARIA Label. You can modify both the LaTeX source code and the ARIA Label by typing directly into these fields.