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I want to input equations with special characters in a question, is there some way to do that? Is there like some program or some code to do it?

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    $\begingroup$ See if this (and links within) helps you. $\endgroup$ – David Z Sep 10 '13 at 6:30
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We use LaTeX here (powered by MathJax).

I have a small tutorial here on using LaTeX in posts. There are more links below.

This tutorial is also pretty nice. We have a short FAQ entry here

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