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How does one add a LaTeX output to a question/answer?

I have seen that some users include a preview of how the LaTeX code will be rendered. Are they just including a picture they have compiled and uploaded, or is there a way to do this automatically on this site?

marked as duplicate by Stephan Lehmke, Werner, doncherry, N.N., diabonas Dec 30 '12 at 23:41

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