fn1

f(g(x))

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <ci>f</ci>
    <apply>
      <ci>g</ci>
      <ci>x</ci>
    </apply>
  </apply>
</math>

Author: Design Science, Inc. (E. Cannon, E. Tabacman, R.Miner)