Using MathML as original source is pretty much out of the question, too.
<math>
<msqrt>
<mfrac>
<mrow><mnɮ</mn><mi>π</mi></mrow>
<mrow><mi>κ</mi></mrow>
</mfrac>
<mfenced open="(" close=")">
<mnɭ</mn>
<mi>−</mi>
<mi>β</mi>
<msup>
<mrow><mnɮ</mn></mrow>
</msup> <mi>/</mi><mnɮ</mn></mfenced></msqrt></math>