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If you love math, TeX and code, here's a treasure trove for you:

1. There is a JS library called math.js.

2. It has a very advanced mathematical expression compiler which can transform an expression into a computed value, AST (node tree) or optimised JavaScript function.

3. Every node has a method toTex() that will convert that sub-expression into TeX.

Now:

1. Implement your math code in math.js.

2. Add KaTeX.

3. Instantly render your code in sexy typeset math notation.