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      <p bold="true">System response 2nd order NON-homogeneous</p>
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        <p>1. recursive simulation algorithm ... shrink/expand from Δt.2. a1 sets the amplitude ... increasing Δt increases overshoot.</p>
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        <p>shrink/expand from Δt</p>
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        <e type="operand">c4</e>
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        <e type="operand">c5</e>
        <e type="operator" args="2">+</e>
        <e type="bracket">(</e>
        <e type="operand">x</e>
        <e type="operand">i</e>
        <e type="operand">2</e>
        <e type="operator" args="2">-</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="operand">c4</e>
        <e type="operand">2</e>
        <e type="operand">c5</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="bracket">(</e>
        <e type="operand">Δx</e>
        <e type="operand">i</e>
        <e type="operand">1</e>
        <e type="operator" args="2">-</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="operand">c5</e>
        <e type="operand">ΔΔx</e>
        <e type="operand">i</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="operator" args="2">≡</e>
      </input>
    </math>
  </region>
</regions>