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Every so often I see a question like http://mathoverflow.net/questions/101215/, which asks for a rational function to be simplified. What mystifies me about it is that the math is in LaTeX (not just dollar signs, but \dfrac), when I would have thought LaTeX was a much more exotic skill than algebra. Of course it's not a difficult skill, but it's still the sort of thing one would either have to know in advance or look up at the time of asking the question. Am I missing something, for example an easy way to get LaTeX into MO questions? I guess in principle it could be a sign of trolling, but it doesn't look like that to me.
I can testify that in our university physics students, for example, are required to submit their homework in LaTeX from the first year, so physics students know [bad] LaTeX.
(On the other hand, mathematics students are not required to know anything about using LaTeX until well into their M.Sc.)
To illustrate Angelo's comment: Equation editor is one that has been passed around quite often over at MSE.