mathmlben
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text/mathml
<math
xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="left-parenthesis x minus y right-parenthesis squared upper U equals left-parenthesis StartRoot x Superscript 4 Baseline plus a Superscript 4 Baseline EndRoot plus StartRoot y Superscript 4 Baseline plus a Superscript 4 Baseline EndRoot right-parenthesis squared minus left-parenthesis x squared minus y squared right-parenthesis squared">
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<annotation encoding="application/x-tex">(x-y)^{2}U=\left({\sqrt {x^{4}+a^{4}}}+{\sqrt {y^{4}+a^{4}}}\right)^{2}-(x^{2}-y^{2})^{2}</annotation>
</semantics>
</math>