mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="12px"><mrow><msup><mfenced separators="|"><mrow><mi>x</mi><mo>+</mo><mi>y</mi></mrow></mfenced><mn>2</mn></msup><mo>=</mo><mi></mi><msup><mfenced separators="|"><msqrt><mn>3</mn></msqrt></mfenced><mn>2</mn></msup></mrow></mstyle></math>