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<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>sine_integral</title>
<!-- MathML created with MathCast Equation Editor version 0.92 -->
</head>
<body>
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mi>S</mi>
    <mi>i</mi>
    <mfenced>
      <mrow>
        <mi>z</mi>
      </mrow>
    </mfenced>
    <mo>=</mo>
    <mfrac>
      <mi>&#x3c0;</mi>
      <mn>2</mn>
    </mfrac>
    <mo>&#x2212;</mo>
    <msubsup>
      <mo>&#x222b;</mo>
      <mrow>
        <mn>0</mn>
      </mrow>
      <mrow>
        <mfrac>
          <mi>&#x3c0;</mi>
          <mn>2</mn>
        </mfrac>
      </mrow>
    </msubsup>
    <msup>
      <mi>e</mi>
      <mrow>
        <mo>&#x2212;</mo>
        <mi>z</mi>
        <mi>cos</mi>
        <mfenced>
          <mrow>
            <mi>t</mi>
          </mrow>
        </mfenced>
      </mrow>
    </msup>
    <mi>cos</mi>
    <mfenced>
      <mrow>
        <mi>z</mi>
        <mi>sin</mi>
        <mfenced>
          <mrow>
            <mi>t</mi>
          </mrow>
        </mfenced>
      </mrow>
    </mfenced>
    <mi>d</mi>
    <mi>t</mi>
  </mrow>
</math></body>
</html>