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I am not able to use some special symbols like for theta, alpha and all similar symbols. Also, how to get on with the exponent and fraction?

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    which site are you interested in?
    – Federico
    Dec 20 '18 at 12:36
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    Possible duplicate of The MathJax help link should point to a more specific guide
    – gnat
    Dec 20 '18 at 14:56
  • see also: Which Stack Exchange sites use MathJax?
    – gnat
    Dec 20 '18 at 14:56
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    So far as I can see, this is not off-topic, because MathJax is part of the Stack Exchange network. The proposed duplicate seems like a stretch, and possibly unhelpful. I also don't see anything wrong with leaving it open. I vote to leave this question alone.
    – hat
    Dec 20 '18 at 15:43
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    However, please edit your question to include details of where you are trying to use this.
    – hat
    Dec 20 '18 at 15:45
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First, check whether the site you're posting on actually supports MathJax: Which Stack Exchange sites use MathJax?

There's a tutorial/reference guide on Mathematics Meta; there you will find how to produce the right symbols and formatting: MathJax basic tutorial and quick reference.

If MathJax is not enabled on the site, you can simulate a fraction of it with HTML entities and Unicode. This very site does not have MathJax enabled, but writing &alpha; produces α, and 2<sup>3</sup> produces 23. Fractions don't work, but small fractions like 1/2 can be written in plain text as well.

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    Fractions (at least the common ones) do work: ½, ⅓, ¼, ⅔, ¾. (That's U+00BD, U+2153, U+00BC, U+2154, and U+00BE, respectively.) You can produce them in an editor and then copy and paste them, or you can use something like AutoHotkey for Windows that lets you map them to keystrokes. Dec 20 '18 at 15:21

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