The FunctionAdvisor(describe, math_function) command returns a description for the function.

$\mathrm{FunctionAdvisor}\left(\mathrm{describe}\,\sin \right)$

$\sin =\mathrm{sine\; function}$

$\mathrm{FunctionAdvisor}\left(\mathrm{describe}\,\mathrm{arccsc}\right)$

$\mathrm{arccsc}=\mathrm{inverse\; cosecant\; (csc)\; function}$

$\mathrm{FunctionAdvisor}\left(\mathrm{describe}\,\mathrm{BesselK}\right)$

$\mathrm{BesselK}=\mathrm{Modified\; Bessel\; function\; of\; the\; second\; kind}$