mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><msqrt><msup><mfenced separators="|"><mi>OA</mi></mfenced><mn>2</mn></msup><mo>+</mo><msup><mfenced separators="|"><mi>OB</mi></mfenced><mn>2</mn></msup></msqrt><mo>=</mo><msqrt><msup><mi mathvariant="normal">x</mi><mn>2</mn></msup><mo>+</mo><msup><mi mathvariant="normal">x</mi><mn>2</mn></msup></msqrt></math>