LaTeX is good for typing math equation or some specific symbols in the post. The Basic idea is:

$ latex YourLaTexCode$

For example,

$ latex E(x)=\frac{\sum_{i=1}^n(x_i-\bar{x})}{n}&s=3$

parameter s assigns the font size from 4 to -4 (4 is the biggest)

## Reference:

The document about writing LaTeX in WordPress

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