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Textbox questions can use the mathjax type for student editor. this allows students to use mathjax and see there answered render during an exam:
Staff
If Rogo is using the tinymce editor then admins can preview the mathjax they have entered using the 'preview' button:
If Rogo is not using the tinymce editor and just the plain text editor. Then mathjax preview is also available to admins when they are creating questions:
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