1<mrow><mi>r</mi><mo>=</mo><msqrt><mrow><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><msup><mi>y</mi><mn>2</mn></msup></mrow></msqrt><mo>+</mo><msqrt><mrow><mi>a</mi><mo>+</mo><mi>b</mi></mrow></msqrt><mo>+</mo><msqrt><mover><mi>x</mi><mo>^</mo></mover></msqrt><mo>+</mo><msqrt><mrow></mrow></msqrt><mo>+</mo><msqrt></msqrt></mrow>
2