MathJax does not work for hyperbolic $ \sech \,x$... Can it be now included? Thanks in advance.
EDIT1:
From user1729's comment suggestion, they work okay:
$$\operatorname{sech}(x) $$
$$ \DeclareMathOperator{\sech}{sech} $$
$$\sech (y)$$
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1 Answer
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To make my comments into an answer:
Firstly, you can define it manually, so \operatorname{sech}(x) renders as $\operatorname{sech}(x)$. A more fancy way is to put \DeclareMathOperator{\sech}{sech} somewhere in your post, and then \sech will work everywhere in the post.
For example, I'll declare the operator (invisibly) here: $\DeclareMathOperator{\sech}{sech}$
And it renders nicely here: $\sech(x)$
(Click on "edit", below, to see my code.)
There are other ways to do this. For example, you can use \newcommand rather than \DeclareMathOperator: \newcommand{\csch}{\operatorname{csch} $\newcommand{\csch}{\operatorname{csch}}$ gives $\csch(x)$.
(One way not to do it is to use \mathrm{csch} rather than \operatorname{csch}. For example, \operatorname{csch}x $\operatorname{csch}x$ is correctly spaced while \mathrm{csch} $\mathrm{csch}x$ is not. See here for more details.)
\operatorname{sech}(x)renders as $\operatorname{sech}(x)$. $\endgroup$\DeclareMathOperator{\sech}{sech}$\DeclareMathOperator{\sech}{sech}$ to define it everywhere in your post. So typingsech(x)now gives $\sech(x)$. (There is a way, or used to be a way, to define commands for a whole page, but I can't remember it at the moment.) $\endgroup$\DeclareMathOperatorshould work, in the sense that it worked above for me... $\endgroup$