All trig functions.
<math xmlns="http://www.w3.org/1998/Math/MathML"> <apply> <plus/> <apply> <sin/> <ci>x</ci> </apply> <apply> <cos/> <ci>x</ci> </apply> <apply> <tan/> <ci>x</ci> </apply> <apply> <sec/> <ci>x</ci> </apply> <apply> <csc/> <ci>x</ci> </apply> <apply> <cot/> <ci>x</ci> </apply> <apply> <sinh/> <ci>x</ci> </apply> <apply> <cosh/> <ci>x</ci> </apply> <apply> <tanh/> <ci>x</ci> </apply> <apply> <sech/> <ci>x</ci> </apply> <apply> <csch/> <ci>x</ci> </apply> <apply> <coth/> <ci>x</ci> </apply> <apply> <arcsin/> <ci>x</ci> </apply> <apply> <arccos/> <ci>x</ci> </apply> <apply> <arctan/> <ci>x</ci> </apply> <apply> <arcsec/> <ci>x</ci> </apply> <apply> <arccsc/> <ci>x</ci> </apply> <apply> <arccot/> <ci>x</ci> </apply> <apply> <arcsinh/> <ci>x</ci> </apply> <apply> <arccosh/> <ci>x</ci> </apply> <apply> <arctanh/> <ci>x</ci> </apply> <apply> <arcsech/> <ci>x</ci> </apply> <apply> <arccsch/> <ci>x</ci> </apply> <apply> <arccoth/> <ci>x</ci> </apply> </apply> </math>