'\usepackage fails in VsCode Jupyter Notebook: Katex parse error undefined control sequence

I want to usepackage{amsmath} so I can get access to various features in my markdown. When I put $$\usepackage{amsmath}$$ in a markdown cell and try to display it, it says:

ParseError: KaTeX parse error: Undefined control sequence: \usepackage at position 1

How can I get this and other packages? I'm using VSCode to edit, and publishing on Google Colab.

I suspect that I'm misunderstanding how packages are supposed to be installed for Jupyter Notebook markdown.

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'\usepackage fails in VsCode Jupyter Notebook: Katex parse error undefined control sequence

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