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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. – Jason Bassford Dec 20 '18 at 15:21

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