mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>x</mi><mo>=</mo><mfrac><mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></mfenced><mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>-</mo><mn>1</mn></mrow></mfenced></mfrac><mo>&#xD7;</mo><mfrac><mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></mfenced><mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></mfenced></mfrac><mo>=</mo><mfrac><msup><mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></mfenced><mn>2</mn></msup><mfenced><mrow><mn>3</mn><mo>-</mo><mn>1</mn></mrow></mfenced></mfrac><mspace linebreak="newline"/><mo>=</mo><mfrac><mrow><mn>3</mn><mo>+</mo><mn>1</mn><mo>+</mo><mn>2</mn><msqrt><mn>3</mn></msqrt></mrow><mn>2</mn></mfrac><mo>=</mo><mn>2</mn><mo>+</mo><msqrt><mn>3</mn></msqrt><mspace linebreak="newline"/><mi>y</mi><mo>=</mo><mfrac><mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>-</mo><mn>1</mn></mrow></mfenced><mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>+</mo><mn>1</mn></mrow></mfenced></mfrac><mo>&#xD7;</mo><mfrac><mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>-</mo><mn>1</mn></mrow></mfenced><mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>-</mo><mn>1</mn></mrow></mfenced></mfrac><mo>=</mo><mfrac><msup><mfenced><mrow><msqrt><mn>3</mn></msqrt><mo>-</mo><mn>1</mn></mrow></mfenced><mn>2</mn></msup><mrow><mo>(</mo><mn>3</mn><mo>-</mo><mn>1</mn><mo>)</mo></mrow></mfrac><mspace linebreak="newline"/><mo>=</mo><mfrac><mrow><mn>3</mn><mo>+</mo><mn>1</mn><mo>-</mo><mn>2</mn><msqrt><mn>3</mn></msqrt></mrow><mn>2</mn></mfrac><mo>=</mo><mn>2</mn><mo>-</mo><msqrt><mn>3</mn></msqrt><mspace linebreak="newline"/><mi>S</mi><mi>o</mi><mo>,</mo><mo>&#xA0;</mo><msup><mi>x</mi><mn>2</mn></msup><mo>&#xA0;</mo><mo>+</mo><msup><mi>y</mi><mn>2</mn></msup><mo>=</mo><mo>&#xA0;</mo><mn>14</mn></math>