mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mfenced><mrow><msqrt><mn>2</mn></msqrt><mo>-</mo><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac></mrow></mfenced><mn>2</mn></msup></math>