<?xml version="1.0" encoding="UTF-8"?>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mi>Φ</mi>
<mo>=</mo>
<msup>
<mi>Φ</mi>
<mfenced close=")" open="(">
<mi>r</mi>
</mfenced>
</msup>
<msup>
<mi>Φ</mi>
<mfenced close=")" open="(">
<mi>s</mi>
</mfenced>
</msup>
</math>