mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>7</mn></mfrac><msup><mfenced separators="|"><mrow><msup><mi mathvariant="normal">x</mi><mn>2</mn></msup><mo>+</mo><mn>1</mn></mrow></mfenced><mfrac><mn>1</mn><mn>2</mn></mfrac></msup><mo>+</mo><mi mathvariant="normal">C</mi></math>