Test of use of functions as arguments to other operators.
<math xmlns="http://www.w3.org/1998/Math/MathML"> <apply> <apply> <csymbol cd="arith1">minus</csymbol> <csymbol cd="transc1">tan</csymbol> <csymbol cd="transc1">cos</csymbol> </apply> <ci>x</ci> </apply> </math>
Author: Design Science, Inc (D. Doyle, R. Miner)