rec-trig2

sin (cos x + x^3)

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <csymbol cd="transc1">sin</csymbol>
    <apply>
      <csymbol cd="arith1">plus</csymbol>
      <apply>
        <csymbol cd="transc1">cos</csymbol>
        <ci>x</ci>
      </apply>
      <apply>
        <csymbol cd="arith1">power</csymbol>
        <ci>x</ci>
        <cn>3</cn>
      </apply>
    </apply>
  </apply>
</math>

Author: MathML 2 Recomendation