data/snuggletex/181.mml
<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>U</mi><mn>4</mn></msub><mfenced close=")" open="("><mi>x</mi></mfenced><mo>=</mo><mn>16</mn><msup><mi>x</mi><mn>4</mn></msup><mo>-</mo><mn>12</mn><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mn>1</mn></math>