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I'm trying to write hyperbolic functions like sech, csch, etc,
Since amsmath doesn't recognize them in the form \sech, \csch, ...
I wrote a preamble like \DeclareMathOperator{\sech}{sech} but I get this error:
! LaTex Error: Command \tanh already defined.
Or name \end... illegal, see p. 192 of the manual.
how should I write the hyperbolic functions?
not all the hyperbolic functions are defined in amsmath (actually, in amsopn.sty).
only \sinh, \cosh, \tanh and \coth are defined there.
you can define the others exactly like you've shown for \sech, and can check in
amsopn.sty if you encounter any other conflicts.
amsopn.sty was never meant to be exhaustive. it covers only the operator names
found most frequently in ams publications as of the time it was compiled.
there are surely many other possibilities.
tanh and coth were already defined, sech and csch needed to be defined in the preamble. thanks
\documentclass{...}and ending with\end{document}.tanhandcothwere already defined,sechandcschneededd to be defined in the preamble\sechetc are quite rare, in my point of view, so they weren't defined.