arccos2

arccos (5 pi)

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <csymbol cd="transc1">arccos</csymbol>
    <apply>
      <csymbol cd="arith1">times</csymbol>
      <cn>5</cn>
      <csymbol cd="nums1">pi</csymbol>
    </apply>
  </apply>
</math>

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