1<?xml version='1.0'?> 2<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN' 3 'http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd' 4 [<!ENTITY mathml 'http://www.w3.org/1998/Math/MathML'>]> 5<html xmlns='http://www.w3.org/1999/xhtml'> 6<head><title>trigamma2</title> 7<!-- MathML created with MathCast Equation Editor version 0.89 --> 8</head> 9<body> 10<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> 11 <mrow> 12 <msup> 13 <mi>ψ</mi> 14 <mfenced> 15 <mrow> 16 <mn>1</mn> 17 </mrow> 18 </mfenced> 19 </msup> 20 <mfenced> 21 <mrow> 22 <mn>1</mn> 23 <mo>−</mo> 24 <mi>x</mi> 25 </mrow> 26 </mfenced> 27 <mo>=</mo> 28 <mfrac> 29 <mrow> 30 <msup> 31 <mi>π</mi> 32 <mn>2</mn> 33 </msup> 34 </mrow> 35 <mrow> 36 <msup> 37 <mi>sin</mi> 38 <mn>2</mn> 39 </msup> 40 <mfenced> 41 <mrow> 42 <mi>π</mi> 43 <mi>x</mi> 44 </mrow> 45 </mfenced> 46 </mrow> 47 </mfrac> 48 <mo>−</mo> 49 <msup> 50 <mi>ψ</mi> 51 <mfenced> 52 <mrow> 53 <mn>1</mn> 54 </mrow> 55 </mfenced> 56 </msup> 57 <mfenced> 58 <mrow> 59 <mi>x</mi> 60 </mrow> 61 </mfenced> 62 </mrow> 63</math> 64</body> 65</html>