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      <header alignment="Center" color="#a9a9a9">&amp;[DATE] &amp;[TIME] - &amp;[FILENAME]</header>
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        <e type="operand">2</e>
        <e type="operator" args="2">/</e>
        <e type="function" preserve="true" args="1">sin</e>
        <e type="bracket">(</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operand">Φ1</e>
        <e type="function" preserve="true" args="1">cos</e>
        <e type="operand">Φ2</e>
        <e type="function" preserve="true" args="1">cos</e>
        <e type="operator" args="2">*</e>
        <e type="operand">Δλ</e>
        <e type="operand">2</e>
        <e type="operator" args="2">/</e>
        <e type="function" preserve="true" args="1">sin</e>
        <e type="bracket">(</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="function" preserve="true" args="1">sqrt</e>
        <e type="function" preserve="true" args="1">asin</e>
        <e type="operand" style="string">by default arc length in radian</e>
        <e type="operator" args="2">≡</e>
      </input>
    </math>
  </region>
  <region id="22" left="27" top="675" width="339" height="24" color="#000000" bgColor="#ffffff" fontSize="10">
    <text lang="eng">
      <p>Both formulas need be mutiplied by 2*π*R</p>
    </text>
  </region>
</regions>