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      <author>Alvaro Diaz Falconi</author>
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      <footer alignment="Center" color="#a9a9a9">&amp;[PAGENUM] / &amp;[COUNT]</footer>
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          <p style="font-weight: bold;">Animating a path</p>
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          <p>Iterations</p>
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          <e type="operand">N</e>
          <e type="operand">150</e>
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          <e type="operand">k</e>
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          <p>Interval</p>
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          <e type="operand">a</e>
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          <e type="operand">b</e>
          <e type="operand">2</e>
          <e type="operand">π</e>
          <e type="operator" args="2">*</e>
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          <e type="operand">T</e>
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          <e type="function" args="2">el</e>
          <e type="operand">b</e>
          <e type="operand">a</e>
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          <e type="operand">1</e>
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          <p>Plane path</p>
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          <e type="operand">t</e>
          <e type="function" args="1">x</e>
          <e type="operand">3</e>
          <e type="operand">5</e>
          <e type="operand">t</e>
          <e type="operator" args="2">*</e>
          <e type="function" args="1">cos</e>
          <e type="operand">4</e>
          <e type="operand">t</e>
          <e type="operator" args="2">*</e>
          <e type="function" args="1">sin</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
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          <e type="operand">X</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">T</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="function" args="1">x</e>
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          <e type="operand">path</e>
          <e type="operand">0</e>
          <e type="operand">2</e>
          <e type="function" args="2">matrix</e>
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          <e type="operand">t</e>
          <e type="function" args="1">y</e>
          <e type="operand">2</e>
          <e type="operand">3</e>
          <e type="operand">t</e>
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          <p>Animate over k</p>
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          <e type="operand">t</e>
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          <e type="operand">0</e>
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          <e type="function" args="2">el</e>
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          <e type="operand">t</e>
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          <e type="operand">2</e>
          <e type="operand">2</e>
          <e type="function" args="6">mat</e>
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          <e type="operand">X</e>
          <e type="operand">t</e>
          <e type="function" args="2">el</e>
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          <e type="operand">t</e>
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          <e type="operand" style="string">o</e>
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          <e type="operand">4</e>
          <e type="operand">1</e>
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    <region left="513" top="252" width="241" height="40" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p>Try to keep x,y,z,t undefined. Use uppercae instead.</p>
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    <region left="513" top="315" width="219" height="40" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p>Notice that x(t) is not the same than x.</p>
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    <region left="513" top="378" width="249" height="40" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
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          <p>The lowercase t variable in the plot is not T, it is k</p>
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        <content>
          <p>blue<br />red<br /><br /><br />green<br />violet</p>
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    <region left="513" top="477" width="234" height="40" color="#000000" fontSize="10">
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          <p>Add or delete elements in the plot at yor glance</p>
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    <region left="18" top="576" width="65" height="24" color="#000000" fontSize="10" isBreakable="false">
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        <content>
          <p>Tangent</p>
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          <e type="operand">m</e>
          <e type="operand">k</e>
          <e type="function" args="2">el</e>
          <e type="operand">100000</e>
          <e type="operand">k</e>
          <e type="operand">1</e>
          <e type="operator" args="2">≡</e>
          <e type="bracket">(</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="function" args="1">abs</e>
          <e type="operand">0</e>
          <e type="operator" args="2">≈</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">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>
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          <e type="function" args="2">el</e>
          <e type="operator" args="2">-</e>
          <e type="operator" args="2">/</e>
          <e type="function" args="3">cases</e>
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          <e type="operand">2</e>
          <e type="function" args="2">matrix</e>
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          <e type="operand">path</e>
          <e type="operand">path</e>
          <e type="operand">X</e>
          <e type="operand">t</e>
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          <e type="operand">Y</e>
          <e type="operand">t</e>
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          <e type="operand">m</e>
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          <e type="operand">x</e>
          <e type="operand">X</e>
          <e type="operand">t</e>
          <e type="function" args="2">el</e>
          <e type="operator" args="2">-</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operand">Y</e>
          <e type="operand">t</e>
          <e type="function" args="2">el</e>
          <e type="operator" args="2">+</e>
          <e type="operand">X</e>
          <e type="operand">t</e>
          <e type="function" args="2">el</e>
          <e type="operand">Y</e>
          <e type="operand">t</e>
          <e type="function" args="2">el</e>
          <e type="operand" style="string">o</e>
          <e type="function" args="3">augment</e>
          <e type="operand">3</e>
          <e type="operand">1</e>
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