mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="12px"><mrow><mn>1</mn><mo>-</mo><mfenced open="[" close="]" separators="|"><mrow><mfrac><mrow><mn>1</mn><mo>+</mo><msqrt><mn>3</mn></msqrt></mrow><mn>2</mn></mfrac><mo>&#x2012;</mo><mfrac><mn>1</mn><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></mfrac></mrow></mfenced><mspace linebreak="newline"/><mo>=</mo><mn>1</mn><mo>-</mo><mfenced open="[" close="]" separators="|"><mfrac><mrow><msup><mfenced separators="|"><mrow><mn>1</mn><mo>+</mo><msqrt><mn>3</mn></msqrt></mrow></mfenced><mn>2</mn></msup><mo>-</mo><mn>2</mn></mrow><mrow><mn>2</mn><mfenced separators="|"><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></mfenced></mrow></mfrac></mfenced><mspace linebreak="newline"/><mo>=</mo><mn>1</mn><mo>-</mo><mfenced open="[" close="]" separators="|"><mfrac><mrow><mn>1</mn><mo>+</mo><mn>2</mn><mi mathvariant="normal">.</mi><msqrt><mn>3</mn></msqrt><mi mathvariant="normal">.</mi><mn>1</mn><mo>+</mo><mi mathvariant="normal">.</mi><mn>3</mn><mo>-</mo><mn>2</mn></mrow><mrow><mn>2</mn><mfenced separators="|"><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></mfenced></mrow></mfrac></mfenced><mspace linebreak="newline"/><mo>=</mo><mn>1</mn><mo>-</mo><mfenced open="[" close="]" separators="|"><mfrac><mrow><mn>2</mn><mfenced separators="|"><mrow><mn>1</mn><mo>+</mo><msqrt><mn>3</mn></msqrt></mrow></mfenced></mrow><mrow><mn>2</mn><mfenced separators="|"><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></mfenced></mrow></mfrac></mfenced><mspace linebreak="newline"/><mo>=</mo><mo>&#xA0;</mo><mn>1</mn><mo>&#xA0;</mo><mo>&#x2012;</mo><mo>&#xA0;</mo><mn>1</mn><mo>&#xA0;</mo><mo>=</mo><mo>&#xA0;</mo><mn>0</mn></mrow></mstyle></math>