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<head><title>floating_point_eg3</title>
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      <mrow>
        <mn>3</mn>
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    <mfrac>
      <mi>d</mi>
      <mrow>
        <mi>d</mi>
        <mi>x</mi>
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    <mi>sin</mi>
    <mi>x</mi>
    <msub>
      <mo>|</mo>
      <mrow>
        <mi>x</mi>
        <mo>=</mo>
        <mfrac>
          <mi>&#x03C0;</mi>
          <mn>3</mn>
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    <mo>=</mo>
    <mi>cos</mi>
    <mfrac>
      <mi>&#x03C0;</mi>
      <mn>3</mn>
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    <mo>=</mo>
    <mfrac>
      <mn>1</mn>
      <mn>2</mn>
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