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This site does L^AT_EX

Not So Short Introduction to L^AT_EX. Good Intro.
Quick L^AT_EX at Wikipedia
L^AT_EX Symbols,

 (my) L^AT_EX Symbols.

$\displaystyle \int_0^{\infty} \log x dx$

$\begin{eqnarray*}\\\n &x& = 2 \\\n &x& + y = 0\n\end{eqnarray*}$

Awsome…

$\begin{eqnarray*} &x& = 2 \\ &x& + y = 0 \end{eqnarray*}$

$\begin{eqnarray*} f\bigl(\,(a_1\cos\theta+a_2\sin\theta) +(b_1\cos\theta &+& b_2\sin\theta)\,\bigr) \\ &=&f\bigl(\,(a_1+b_1)\cos\theta+(a_2+b_2)\sin\theta\,\bigr) \\ &=&\colvec{a_1+b_1 \\ a_2+b_2} \\ &=&\colvec{a_1 \\ a_2}+\colvec{b_1 \\ b_2} \\ &=&f(a_1\cos\theta+a_2\sin\theta)+f(b_1\cos\theta+b_2\sin\theta) \end{eqnarray*}$

Wiki Sandbox

This site does LATEX

This site does L^AT_EX