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This question already has an answer here:

How can I type math symbols in this forum, like set operators, etc.?

If this question is repeated, I am sorry I just searched and couldn't find an answer.

And could anyone give me hint to use Tags for this question?

Thank you!

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marked as duplicate by user61527, Alex Becker May 7 '14 at 2:59

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

migrated from math.stackexchange.com May 7 '14 at 2:54

This question came from our site for people studying math at any level and professionals in related fields.

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    $\begingroup$ This should be posted on the Mathematics Meta SE $\endgroup$ – Alex G. May 7 '14 at 2:23
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Using Latex and $<\text{the thing you need to type here}>$

E.g. $x^2$ is $\$$x^2$\$$

$\infty$ is $\$$\infty$\$$

$e^{i\pi} + 1 = 0$ is $\$$e^{i\pi} + 1 = 0$\$$

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    $\begingroup$ If you use backticks (```), then anything between them appears as unformatted text: $x^2$. $\endgroup$ – Emily May 7 '14 at 2:43
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First, once you get $5$ reputation, you can ask this on http://meta.stackexchange.com Never mind that, it will only get closed as a duplicate of the MathJax tutorial I will talk about below.

Next, if you want a LaTeX / MathJax tutorial, click here. If you are looking for specific symbols like $\pi$ (pi), then you should try Dextify.

Hope I helped

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