<?xml version='1.0'?>
<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN'
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<html xmlns='http://www.w3.org/1999/xhtml'>
<head><title>jacobi1</title>
<!-- MathML created with MathCast Equation Editor version 0.89 -->
</head>
<body>
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mi>u</mi>
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    <mo>=</mo>
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    <munderover>
      <mo>&#x222B;</mo>
      <mrow>
        <mn>0</mn>
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      <mi>&#x03C6;</mi>
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    <mfrac>
      <mrow>
        <mi>d</mi>
        <mi>&#x03C6;</mi>
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            <mrow>
              <mn>1</mn>
              <mo>&#x2212;</mo>
              <msup>
                <mi>k</mi>
                <mn>2</mn>
              </msup>
              <msup>
                <mi>sin</mi>
                <mn>2</mn>
              </msup>
              <mi>&#x03C6;</mi>
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</math>
</body>
</html>
