mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced separators="|"><mrow><msup><mi>sec</mi><mn>2</mn></msup><mo>&#x2061;</mo><msup><mi>sec</mi><mn>2</mn></msup><mi mathvariant="normal">A</mi><mo>+</mo><mn>1</mn></mrow></mfenced></math>