Markdown Formatting

Hi all. I am trying to complete my lab assignment. However, I am encountering issue that the equation is not showing in markdown cell. Does anyone know why?
It didn’t seem to be an issue during previous course I did.

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Thank you!

Typically this is a problem in your browser, often it’s a bad cache. Might be that the LaTeX viewer is being blocked by your browser (a plugin perhaps).

Thanks for the suggestion, it was solved after restarting my PC!