Summary: Use this \(\LaTeX\) notation. The others are tested below.
This is inline $latex\Latex$ notation. $latex\vec{F}=m\vec{a}$.
This is new line notation: $$\LaTeX$$ $$\vec{F} = m\vec{a} . $$
Below is a “shortcode” block using $latex:
\(\vec{x}\)
Shortcode using the latex block:
\(\LaTeX\quad\vec{x} \)
HTML:
\(i\hbar\frac{\partial}{\partial t}\left|\Psi(t)\right> =H\left|\Psi(t)\right>\)If all works right, hopefully the equation \(\vec{x} = a^2 + b^2\) creates inline latex.