LaTeX in a WordPress blog

An inline formula x^2-1=1 written using \LaTeX

and down here we have another inline formula: e^{\pi i}+1=0.

As can be seen from these examples, you shouldn’t write inline formulae. This displayed formula,

\cfrac{1}{1+\cfrac{1}{1+\cfrac{1}{1+\cfrac{1}{1+x}}}}

does, however, look good; it is written using the code

$latex \cfrac{1}{1+\cfrac{1}{1+\cfrac{1}{1+\cfrac{1}{1+x}}}}$

In general you insert a formula using the code:

$latex your formula in LaTeX-code $

There is some documentation at LaTeX support.