rec-int4

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <csymbol cd="calculus1">defint</csymbol>
    <apply>
      <csymbol cd="interval1">interval</csymbol>
      <ci>a</ci>
      <ci>b</ci>
    </apply>
    <bind>
      <csymbol cd="fns1">lambda</csymbol>
      <bvar>
        <ci>x</ci>
      </bvar>
      <apply>
        <csymbol cd="transc1">cos</csymbol>
        <ci>x</ci>
      </apply>
    </bind>
  </apply>
</math>

Author: MathML 2 Recommendation