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Using the wordpress implementation of LaTeX allows me to get some math into posts, nicely formatted. I wrote about this at least once before.

This: latex \frac{1}{\frac{y}{x} + \frac{x}{y}} = \frac{xy}{x^2 + y^2} will become this:
$\frac{1}{\frac{y}{x} + \frac{x}{y}} = \frac{xy}{x^2 + y^2}$ when dollar signs are in front of latex and at the end of the type.

This:  latex e^{ix} = \cos x + i \sin x becomes: $e^{ix} = \cos x + i \sin x$

This: latex x = \sqrt{2 + \sqrt{2 +\sqrt{2 +\sqrt{2 +\sqrt{2 + …}}}}} becomes $x = \sqrt{2 + \sqrt{2 +\sqrt{2 +\sqrt{2 +\sqrt{2 + ...}}}}}$

This: latex A \cup B becomes $A \cup B$

This: latex S \subset T \rightarrow n(S) < n(T) becomes $S \subset T \rightarrow n(S) < n(T)$

and so on. Ask me if you want to see anything else in particular. I’m no expert, but figuring them out is a good exercise for me.