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      <header alignment="Center" color="#a9a9a9">&amp;[DATE] &amp;[TIME] - &amp;[FILENAME]</header>
      <footer alignment="Center" color="#a9a9a9">&amp;[PAGENUM] / &amp;[COUNT]</footer>
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        <content>
          <p style="font-weight: bold;">V. Ochkov rigid catenary example.</p>
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        <content>
          <p>Reference:</p>
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    <region left="378" top="9" width="359" height="24" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p>http://twt.mpei.ac.ru/MCS/Worksheets/chain.xmcd</p>
        </content>
      </text>
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    <region left="18" top="45" width="58" height="24" color="#000000" fontSize="10">
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        <content>
          <p>Values</p>
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        <input>
          <e type="operand">x.A</e>
          <e type="operand">y.A</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operand">0</e>
          <e type="operand">7</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operand" style="unit">m</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
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    <region left="360" top="45" width="147" height="33" color="#000000" bgColor="#ffffcc" fontSize="10">
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        <input>
          <e type="operand">x.B</e>
          <e type="operand">y.B</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operand">30</e>
          <e type="operand">15</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operand" style="unit">m</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
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      </math>
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    <region left="531" top="45" width="66" height="24" color="#000000" bgColor="#ffffcc" fontSize="10">
      <math>
        <input>
          <e type="operand">L</e>
          <e type="operand">37</e>
          <e type="operand" style="unit">m</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
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    <region left="621" top="45" width="102" height="41" color="#000000" bgColor="#ffffcc" fontSize="10">
      <math>
        <input>
          <e type="operand">wo</e>
          <e type="operand">0.5</e>
          <e type="operand" style="unit">kgf</e>
          <e type="operand" style="unit">m</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
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        <content>
          <p style="font-weight: bold;">Method 1</p>
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    <region left="198" top="90" width="217" height="85" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="function" args="1">f</e>
          <e type="operand">a</e>
          <e type="operand">x</e>
          <e type="operand">xo</e>
          <e type="operator" args="2">-</e>
          <e type="operand">a</e>
          <e type="operator" args="2">/</e>
          <e type="function" args="1">cosh</e>
          <e type="operator" args="2">*</e>
          <e type="operand">yo</e>
          <e type="operator" args="2">+</e>
          <e type="operator" args="2">:</e>
          <e type="operand">x</e>
          <e type="function" args="1">f'</e>
          <e type="operand">x</e>
          <e type="function" args="1">f</e>
          <e type="operand">x</e>
          <e type="function" args="2">diff</e>
          <e type="operator" args="2">:</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">line</e>
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          <e type="operand">u</e>
          <e type="function" args="1">eq</e>
          <e type="operand">a</e>
          <e type="operand">xo</e>
          <e type="operand">yo</e>
          <e type="operand">1</e>
          <e type="operand">3</e>
          <e type="function" args="5">mat</e>
          <e type="operand">u</e>
          <e type="function" args="1">transpose</e>
          <e type="operand" style="unit">m</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
          <e type="operand">1</e>
          <e type="operand" style="unit">m</e>
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          <e type="operand">x.A</e>
          <e type="function" args="1">f</e>
          <e type="operand">y.A</e>
          <e type="operator" args="2">-</e>
          <e type="operand">x.B</e>
          <e type="function" args="1">f</e>
          <e type="operand">y.B</e>
          <e type="operator" args="2">-</e>
          <e type="operand">L</e>
          <e type="operand">1</e>
          <e type="operand">x</e>
          <e type="function" args="1">f'</e>
          <e type="operand">2</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">+</e>
          <e type="function" args="1">sqrt</e>
          <e type="operand">x</e>
          <e type="operand">0</e>
          <e type="operand">x.B</e>
          <e type="function" args="4">int</e>
          <e type="operator" args="2">-</e>
          <e type="operand">3</e>
          <e type="operand">1</e>
          <e type="function" args="5">mat</e>
          <e type="operator" args="2">*</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">line</e>
          <e type="operator" args="2">:</e>
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        <content>
          <p>Knowing that the shape is a catenary</p>
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      <math decimalPlaces="2">
        <input>
          <e type="operand">a</e>
          <e type="operand">xo</e>
          <e type="operand">yo</e>
          <e type="operand">3</e>
          <e type="operand">1</e>
          <e type="function" args="5">mat</e>
          <e type="operand">10</e>
          <e type="operand">10</e>
          <e type="operand">10</e>
          <e type="operator" args="1">-</e>
          <e type="operand">3</e>
          <e type="operand">1</e>
          <e type="function" args="5">mat</e>
          <e type="operand">eq</e>
          <e type="function" args="2">al_nleqsolve</e>
          <e type="operand" style="unit">m</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
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        <contract>
          <e type="operand" style="unit">m</e>
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        <result action="numeric">
          <e type="operand">13.95</e>
          <e type="operand">11.94</e>
          <e type="operand">12.37</e>
          <e type="operator" args="1">-</e>
          <e type="operand">3</e>
          <e type="operand">1</e>
          <e type="function" args="5">mat</e>
        </result>
      </math>
    </region>
    <region left="18" top="252" width="87" height="24" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p>Hor. Force</p>
        </content>
      </text>
    </region>
    <region left="126" top="252" width="157" height="30" color="#000000" fontSize="10">
      <math decimalPlaces="2">
        <input>
          <e type="operand">F.H</e>
          <e type="operand">a</e>
          <e type="operand">wo</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
        </input>
        <contract>
          <e type="operand" style="unit">kgf</e>
        </contract>
        <result action="numeric">
          <e type="operand">6.97</e>
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    <region left="18" top="297" width="64" height="24" color="#000000" fontSize="10">
      <text lang="eng" width="64" fontFamily="Consolas" fontSize="10">
        <content>
          <p>Angles</p>
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      </text>
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        <input>
          <e type="operand">θ.A</e>
          <e type="operand">x.A</e>
          <e type="function" args="1">f'</e>
          <e type="function" args="1">atan</e>
          <e type="operator" args="2">:</e>
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        <contract>
          <e type="operand" style="unit">deg</e>
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        <result action="numeric">
          <e type="operand">43.95</e>
          <e type="operator" args="1">-</e>
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    <region left="450" top="297" width="226" height="34" color="#000000" fontSize="10">
      <math decimalPlaces="2">
        <input>
          <e type="operand">θ.B</e>
          <e type="operand">x.B</e>
          <e type="function" args="1">f'</e>
          <e type="function" args="1">atan</e>
          <e type="operator" args="2">:</e>
        </input>
        <contract>
          <e type="operand" style="unit">deg</e>
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        <result action="numeric">
          <e type="operand">59.36</e>
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    <region left="18" top="342" width="73" height="24" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p>Tensions</p>
        </content>
      </text>
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    <region left="126" top="342" width="196" height="55" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">T.A</e>
          <e type="operand">F.H</e>
          <e type="operand">θ.A</e>
          <e type="function" args="1">cos</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
        </input>
        <contract>
          <e type="operand" style="unit">kgf</e>
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        <result action="numeric">
          <e type="operand">9.6875</e>
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    <region left="450" top="351" width="204" height="55" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">T.B</e>
          <e type="operand">F.H</e>
          <e type="operand">θ.B</e>
          <e type="function" args="1">cos</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
        </input>
        <contract>
          <e type="operand" style="unit">kgf</e>
        </contract>
        <result action="numeric">
          <e type="operand">13.6875</e>
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      </math>
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    <region left="18" top="414" width="65" height="24" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p>Minimun</p>
        </content>
      </text>
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      <math>
        <input>
          <e type="operand">x.C</e>
          <e type="operand">x</e>
          <e type="operand" style="unit">m</e>
          <e type="operator" args="2">*</e>
          <e type="function" args="1">f'</e>
          <e type="operand">x</e>
          <e type="function" args="2">roots</e>
          <e type="operand" style="unit">m</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
        </input>
        <result action="numeric">
          <e type="operand">11.9355</e>
          <e type="operand" style="unit">m</e>
          <e type="operator" args="2">*</e>
        </result>
      </math>
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    <region left="450" top="414" width="162" height="32" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">y.C</e>
          <e type="operand">x.C</e>
          <e type="function" args="1">f</e>
          <e type="operator" args="2">:</e>
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        <contract>
          <e type="operand" style="unit">m</e>
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        <result action="numeric">
          <e type="operand">1.5748</e>
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          <p style="font-weight: bold;">Method 2</p>
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          <p>Solving the ODE. All of the parameters are extracting from the numerical solution.</p>
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          <e type="operand">F.H</e>
          <e type="operand">θ.A</e>
          <e type="function" args="2">Clear</e>
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          <e type="operand">1</e>
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          <e type="operand">F.H</e>
          <e type="operand">θ.A</e>
          <e type="operand">N</e>
          <e type="function" args="3">RK</e>
          <e type="operand">x</e>
          <e type="function" args="1">y</e>
          <e type="operand">x.B</e>
          <e type="operand">N</e>
          <e type="function" args="3">Rkadapt</e>
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          <e type="operand">x</e>
          <e type="function" args="1">y''</e>
          <e type="operand">wo</e>
          <e type="operand">F.H</e>
          <e type="operator" args="2">/</e>
          <e type="operand">1</e>
          <e type="operand">x</e>
          <e type="function" args="1">y'</e>
          <e type="operand">2</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">+</e>
          <e type="function" args="1">sqrt</e>
          <e type="operator" args="2">*</e>
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        <input>
          <e type="operand">u</e>
          <e type="function" args="1">eq</e>
          <e type="operand">N</e>
          <e type="operand">301</e>
          <e type="operator" args="2">:</e>
          <e type="operand">RK</e>
          <e type="operand">u</e>
          <e type="operand">1</e>
          <e type="function" args="2">el</e>
          <e type="operand">u</e>
          <e type="operand">2</e>
          <e type="function" args="2">el</e>
          <e type="operand">N</e>
          <e type="operand">1</e>
          <e type="operator" args="2">-</e>
          <e type="function" args="3">RK</e>
          <e type="operator" args="2">:</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operand">X</e>
          <e type="operand">RK</e>
          <e type="operand">1</e>
          <e type="function" args="2">col</e>
          <e type="operator" args="2">:</e>
          <e type="operand">Y</e>
          <e type="operand">RK</e>
          <e type="operand">2</e>
          <e type="function" args="2">col</e>
          <e type="operator" args="2">:</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operand">Y</e>
          <e type="operand">N</e>
          <e type="function" args="2">el</e>
          <e type="operand">X</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">X</e>
          <e type="operand">k</e>
          <e type="operand">1</e>
          <e type="operator" args="2">-</e>
          <e type="function" args="2">el</e>
          <e type="operator" args="2">-</e>
          <e type="operand">Y</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">Y</e>
          <e type="operand">k</e>
          <e type="operand">1</e>
          <e type="operator" args="2">-</e>
          <e type="function" args="2">el</e>
          <e type="operator" args="2">-</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">mat</e>
          <e type="function" args="1">norme</e>
          <e type="operand">k</e>
          <e type="operand">2</e>
          <e type="operand">N</e>
          <e type="function" args="4">sum</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">mat</e>
          <e type="operand">1</e>
          <e type="operand" style="unit">m</e>
          <e type="operator" args="2">/</e>
          <e type="operand">y.B</e>
          <e type="operand">L</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">mat</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">-</e>
          <e type="operand">3</e>
          <e type="operand">1</e>
          <e type="function" args="5">line</e>
          <e type="operator" args="2">:</e>
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      </math>
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      <math>
        <input>
          <e type="operand">x.A</e>
          <e type="function" args="1">y</e>
          <e type="operand">y.A</e>
          <e type="operator" args="2">≡</e>
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