1<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> 2 <mrow> 3 <mtext>beta</mtext> 4 <mfenced> 5 <mrow> 6 <mi>a</mi> 7 <mo>,</mo> 8 <mi>b</mi> 9 </mrow> 10 </mfenced> 11 <mo>=</mo> 12 <mfrac> 13 <mrow> 14 <mfenced> 15 <mrow> 16 <mi>a</mi> 17 <mo>+</mo> 18 <mi>b</mi> 19 </mrow> 20 </mfenced> 21 <mfenced> 22 <mrow> 23 <mi>a</mi> 24 <mo>+</mo> 25 <mi>b</mi> 26 <mo>+</mo> 27 <mn>1</mn> 28 </mrow> 29 </mfenced> 30 </mrow> 31 <mrow> 32 <mi>a</mi> 33 <mi>b</mi> 34 </mrow> 35 </mfrac> 36 <mtext>beta</mtext> 37 <mfenced> 38 <mrow> 39 <mi>a</mi> 40 <mo>+</mo> 41 <mn>1,</mn> 42 <mi>b</mi> 43 <mo>+</mo> 44 <mn>1</mn> 45 </mrow> 46 </mfenced> 47 </mrow> 48</math> 49 50