How do you make superscripts and mathematics in Preview's text annotation?

When adding text annotations that include scientific notations, how do you make superscripts, e.g. "3.2 × 10^{-23}"?
Searching Help for 'superscript' turns up nothing, suggesting the command does not exist, as it does under Baseline etc. in iWork. Please tell me this is not the case! If it is, has the situation been improved in the new operating system?
A related issue: I wish to include other mathematics -- is there a way to include mathematics similar to LaTeX? Might Preview incorporate using latex code in the future, so I can easily type "\exp{-\lambda t}" etc and have the math appear?
I'm adding text annotations to PDF lecture notes in Preview, basically filling in blanks the instructor has left so students will pay attention in class, and these annotations include superscripts; I wish to format properly.
Thank you!

Once you have the circle shape displayed, long press on the border of the circle. Once it is highlighted, drag horizontally or vertically. This should allow you to distort the circle into an ellipse (or the square into a rectangle).
Hope that helps,
Frank
Sketch Engineering

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