rec-inverse4

W3C sample	WIRIS
	$\sin ^{(-1)}(x)$

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

Author: MathML 2 Recomendation