The FunctionAdvisor(class_members, class_name) command returns all the class members that belong to the class.

$\mathrm{FunctionAdvisor}\left(\mathrm{class\_members}\,\mathrm{trig}\right)$

The 6 functions in the "trig" class are:

$\left[\cos \,\cot \,\csc \,\sec \,\sin \,\tan \right]$

$\mathrm{FunctionAdvisor}\left(\mathrm{class\_members}\,\mathrm{elementary}\right)$

The 26 functions in the "elementary" class are:

$\left[\arccos \,\mathrm{arccosh}\,\mathrm{arccot}\,\mathrm{arccoth}\,\mathrm{arccsc}\,\mathrm{arccsch}\,\mathrm{arcsec}\,\mathrm{arcsech}\,\arcsin \,\mathrm{arcsinh}\,\arctan \,\mathrm{arctanh}\,\cos \,\cosh \,\cot \,\coth \,\csc \,\mathrm{csch}\,\exp \,\ln \,\sec \,\mathrm{sech}\,\sin \,\sinh \,\tan \,\tanh \right]$

$\mathrm{FunctionAdvisor}\left(\mathrm{class\_members}\,\mathrm{Bessel\_related}\,\mathrm{quiet}\right)$

$\left[\mathrm{AiryAi}\,\mathrm{AiryBi}\,\mathrm{BesselI}\,\mathrm{BesselJ}\,\mathrm{BesselK}\,\mathrm{BesselY}\,\mathrm{HankelH1}\,\mathrm{HankelH2}\,\mathrm{KelvinBei}\,\mathrm{KelvinBer}\,\mathrm{KelvinHei}\,\mathrm{KelvinHer}\,\mathrm{KelvinKei}\,\mathrm{KelvinKer}\right]$