Well

I think it'll be extremely useful to set a thread which we can test LaTeX.

This would help people which doesn't know anything about this math-language, so they may learn posting right here some things of LaTeX such that get a full domain inside the forum to use it.

Testin'

$\displaystyle x^2$

$\displaystyle a+b$

$\displaystyle \int_a^bF(x)\,dx=f(b)-f(a)$

Also, people can make questions and any person fully-enabled with LaTeX should give the answer