How do I use LaTeX in my question?

[laura_a]

Homework Statement

I have a complicated working out I'd like someone to look at but it's too much without LaTeX and I just can't remember how to embed it... Can someone help me...Thanks :)

 

[kidsmoker]

There's a guide here which gives you the code for different functions:

https://www.physicsforums.com/showthread.php?t=8997

Hope that helps.