<?xml version="1.0" encoding="UTF-8"?>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<msubsup>
<mi>S</mi>
<mi>p</mi>
<mi>m</mi>
</msubsup>
<mfenced close=")" open="(">
<mi>x</mi>
<mi>ξ</mi>
</mfenced>
<mi>sin</mi>
<mfenced close=")" open="(">
<mrow>
<mi>m</mi>
<mi>x</mi>
</mrow>
</mfenced>
</math>