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 <mo>,</mo> 10 <mi>x</mi> 11 </mrow> 12 </mfenced> 13 <mspace width="1em"/> 14 <mo>=</mo> 15 <mspace width="1em"/> 16 <msub> 17 <mi>B</mi> 18 <mi>x</mi> 19 </msub> 20 <mfenced> 21 <mrow> 22 <mi>a</mi> 23 <mo>,</mo> 24 <mi>b</mi> 25 </mrow> 26 </mfenced> 27 <mspace width="1em"/> 28 <mo>=</mo> 29 <mspace width="1em"/> 30 <msubsup> 31 <mo>∫</mo> 32 <mrow> 33 <mn>0</mn> 34 </mrow> 35 <mi>x</mi> 36 </msubsup> 37 <msup> 38 <mi>t</mi> 39 <mrow> 40 <mi>a</mi> 41 <mo>−</mo> 42 <mn>1</mn> 43 </mrow> 44 </msup> 45 <msup> 46 <mfenced> 47 <mrow> 48 <mn>1</mn> 49 <mo>−</mo> 50 <mi>t</mi> 51 </mrow> 52 </mfenced> 53 <mrow> 54 <mi>b</mi> 55 <mo>−</mo> 56 <mn>1</mn> 57 </mrow> 58 </msup> 59 <mi>d</mi> 60 <mi>t</mi> 61 </mrow> 62</math> 63 64