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         <mrow>
          <mrow>
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             <mrow>
              <mrow>
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               <msub>
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              </mstyle>
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         </mrow>
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        <annotation encoding="StarMath 5.0">{partial d^2}
over
{partial u}
=
-2
{bold nitalic w}
cdot
left(
{bold nitalic p}_0
+
t
{bold nitalic v}
-
{bold nitalic q}_0
-
u
{bold nitalic w}
right)
=
0</annotation>
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     </draw:image>
    </draw:frame></text:p>
   <text:p text:style-name="Standard">To eliminate t</text:p>
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       <semantics>
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          <mo stretchy="false">⋅</mo>
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           <mrow>
            <mrow>
             <mrow>
              <msub>
               <mstyle mathvariant="bold">
                <mi mathvariant="normal">p</mi>
               </mstyle>
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              </msub>
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             <mrow>
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              </msub>
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              <mi>u</mi>
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             <mstyle mathvariant="bold">
              <mi mathvariant="normal">w</mi>
             </mstyle>
            </mrow>
           </mrow>
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          </mrow>
         </mrow>
         <mrow>
          <mrow>
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           <mrow>
            <mrow>
             <mstyle mathvariant="bold">
              <mi mathvariant="normal">w</mi>
             </mstyle>
             <mo stretchy="false">⋅</mo>
             <mstyle mathvariant="bold">
              <mi mathvariant="normal">v</mi>
             </mstyle>
            </mrow>
           </mrow>
           <mo fence="true" form="postfix" stretchy="true">)</mo>
          </mrow>
          <mo stretchy="false">=</mo>
          <mn>0</mn>
         </mrow>
        </mrow>
        <annotation encoding="StarMath 5.0">{bold nitalic v}
cdot
left(
{bold nitalic p}_0
+
t
{bold nitalic v}
-
{bold nitalic q}_0
-
u
{bold nitalic w}
right)
left(
{bold nitalic w}
cdot
{bold nitalic v}
right)
=
0</annotation>
       </semantics>
      </math>
     </draw:object><draw:image>
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u
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=
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-
u
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left(
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cdot
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=
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   <text:p text:style-name="Standard">Alternative derivation</text:p>
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