LaTeX formulas show as raw code in preview

[Zman]

Hi

When posting, I am trying to display maths formulae using LaTeX.
It is so much easier to read.
When I hit 'Preview post' all I see is the raw LaTeX;

[tex] 3i\theta + 2ik\pi = i\frac{\pi}{2}<br /> $$<br /> Is there something else that I need?$$[/tex]

 

[robphy]

the closing tag should be [ /tex] (delete the space to make it work)

$$3i\theta + 2ik\pi = i\frac{\pi}{2}$$

 

[Zman]

Brilliant, just like HTML.

Thanks robphy