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    <Task-category name="&lt;default&gt;">
    </Task-category>
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<Task>
</Task>
<Group labelreference="L2" drawlabel="true">
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output">UVxvL0xpYnJhcnkvRnJhbWV3b3Jrcy9NYXBsZS5mcmFtZXdvcmsvVmVyc2lvbnMvMTEvYmluLkFQUExFX1BQQ19PU1g2Ig==</Equation></Text-field>
</Output>
</Group>
<Group labelreference="L1" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">frenet:=proc(alpha,t)
  local alphap, alphapp, alphappp, T, N, B, nu, kappa, tau, apcrossapp, n_apcrossapp, norm;

  alphap:=map(diff,alpha,t);
  alphapp:=map(diff,alphap,t);
  alphappp:=map(diff,alphapp,t);
  norm:=x-&gt;LinearAlgebra[Norm](x,2,conjugate=false);
  nu:=simplify(norm(alphap));
  apcrossapp:=LinearAlgebra[CrossProduct](alphap,alphapp);
  n_apcrossapp:=simplify(norm(apcrossapp));
  kappa:=simplify(n_apcrossapp/nu^3);
  T:=simplify(alphap/nu);
  B:=simplify(apcrossapp/n_apcrossapp);
  N:=simplify(LinearAlgebra[CrossProduct](B,T));
  tau:= simplify(LinearAlgebra[DotProduct](apcrossapp,alphappp,conjugate=false)/n_apcrossapp^2);
  return [ nu, kappa, tau, T, N, B];
end;</Text-field>
</Input>
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="PkknZnJlbmV0RzYiZio2JEkmYWxwaGFHRiRJInRHRiQ2LkknYWxwaGFwR0YkSShhbHBoYXBwR0YkSSlhbHBoYXBwcEdGJEkiVEdGJEkiTkdGJEkiQkdGJEkjbnVHRiRJJmthcHBhR0YkSSR0YXVHRiRJK2FwY3Jvc3NhcHBHRiRJLW5fYXBjcm9zc2FwcEdGJEklbm9ybUdGJEYkRiRDLz5GKi1JJG1hcEclKnByb3RlY3RlZEc2JUklZGlmZkdGOkYnRig+RistRjk2JUY8RipGKD5GLC1GOTYlRjxGK0YoPkY1Zio2I0kieEdGJEYkNiRJKW9wZXJhdG9yR0YkSSZhcnJvd0dGJEYkLSZJLkxpbmVhckFsZ2VicmFHRiQ2I0klTm9ybUdGJDYlRkYiIiMvSSpjb25qdWdhdGVHRjpJJmZhbHNlR0Y6RiRGJEYkPkYwLUkpc2ltcGxpZnlHRiQ2Iy1GNTYjRio+RjMtJkZMNiNJLUNyb3NzUHJvZHVjdEdGJDYkRipGKz5GNC1GVjYjLUY1NiNGMz5GMS1GVjYjKiZGNCIiIilGMCIiJCEiIj5GLS1GVjYjKiZGKkZjb0YwRmZvPkYvLUZWNiMqJkYzRmNvRjRGZm8+Ri4tRlY2Iy1GZm42JEYvRi0+RjItRlY2IyomLSZGTDYjSStEb3RQcm9kdWN0R0YkNiVGM0YsRlFGY28pRjRGUEZmb083KEYwRjFGMkYtRi5GL0YkRiRGJA==">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</Equation></Text-field>
</Output>
</Group>
<Group labelreference="L5" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">frenet_plane:=proc(alpha,t)
  local alphap, alphapp, T, Ns, nu, kappas, norm;

  alphap:=map(diff,alpha,t);
  alphapp:=map(diff,alphap,t);
  norm:=x-&gt;LinearAlgebra[Norm](x,2,conjugate=false);
  nu:=simplify(norm(alphap));
  T:=simplify(alphap/nu);
  Ns:=&lt;-T[2],T[1]&gt;;
  kappas:=simplify(LinearAlgebra[DotProduct](alphapp,Ns,conjugate=false)/nu^2);
  return [ nu, kappas, T, Ns ];
end;</Text-field>
</Input>
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="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">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</Equation></Text-field>
</Output>
</Group>
<Group labelreference="L3" drawlabel="true">
<Input>
<Text-field style="Heading 1" layout="Heading 1">Problem 1.</Text-field>
</Input>
</Group>
<Group labelreference="L4" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">alpha:=&lt;(1+2*cos(t))*cos(t), (1+2*cos(t))*sin(t)&gt;;</Text-field>
</Input>
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="PkkmYWxwaGFHNiItSSdSVEFCTEVHRiQ2JSIoL2oqKSktSSdNQVRSSVhHRiQ2IzckNyMqJiwmIiIiRjAqJiIiI0YwLUkkY29zRzYkJSpwcm90ZWN0ZWRHSShfc3lzbGliR0YkNiNJInRHRiRGMEYwRjBGM0YwNyMqJkYvRjAtSSRzaW5HRjVGOEYwJkknVmVjdG9yR0Y1NiNJJ2NvbHVtbkdGJA==">LSZJJ1ZlY3Rvckc2JCUqcHJvdGVjdGVkR0koX3N5c2xpYkc2IjYjSSdjb2x1bW5HRig2Iy9JJCVpZEdGKCIoL2oqKSk=</Equation></Text-field>
</Output>
</Group>
<Group labelreference="L6" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">plot([alpha[1],alpha[2],t=0..2*Pi]);</Text-field>
</Input>
<Output>
<Text-field style="Maple Plot" layout="Maple Plot"><Plot height="400" type="two-dimensional" width="400" plot-scale="1.0" plot-xtrans="0.0" plot-ytrans="0.0" gridlinevisibility="1" legendvisibility="false">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</Plot></Text-field>
</Output>
</Group>
<Group labelreference="L7" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">alpha_f:=frenet_plane(alpha,t);</Text-field>
</Input>
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="PkkoYWxwaGFfZkc2IjcmKiQpLCYqJiIiJSIiIi1JJGNvc0c2JCUqcHJvdGVjdGVkR0koX3N5c2xpYkdGJDYjSSJ0R0YkRitGKyIiJkYrI0YrIiIjRissJCooIiIkRissJiomRjVGK0YsRitGK0Y4RitGKylGKCNGOEY1ISIiRistSSdSVEFCTEVHRiQ2JSIoW0dAKS1JJ01BVFJJWEdGJDYjNyQ3IywkKigtSSRzaW5HRi5GMUYrLCZGKUYrRitGK0YrRidGPUY9NyMqJiwoRixGKyomRipGKylGLEY1RitGK0Y1Rj1GK0YnRj0mSSdWZWN0b3JHRi42I0knY29sdW1uR0YkLUY/NiUiKCd6KD4qLUZDNiM3JDcjLCRGTUY9RkZGUQ==">NyYqJCwmLUkkY29zRzYkJSpwcm90ZWN0ZWRHSShfc3lzbGliRzYiNiNJInRHRioiIiUiIiYiIiIjRi8iIiMsJComLCZGJUYxIiIkRi9GL0YkIyEiJEYxRjUtJkknVmVjdG9yR0YnNiNJJ2NvbHVtbkdGKjYjL0kkJWlkR0YqIihbR0ApLUY5NiMvRj8iKCd6KD4q</Equation></Text-field>
</Output>
</Group>
<Group labelreference="L8" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">kappa:=alpha_f[2];</Text-field>
</Input>
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="Pkkma2FwcGFHNiIsJCooIiIkIiIiLCYqJiIiI0YoLUkkY29zRzYkJSpwcm90ZWN0ZWRHSShfc3lzbGliR0YkNiNJInRHRiRGKEYoRidGKEYoKSwmKiYiIiVGKEYsRihGKCIiJkYoI0YnRishIiJGKA==">LCQqJiwmLUkkY29zRzYkJSpwcm90ZWN0ZWRHSShfc3lzbGliRzYiNiNJInRHRioiIiMiIiQiIiJGLywmRiUiIiUiIiZGLyMhIiRGLUYu</Equation></Text-field>
</Output>
</Group>
<Group labelreference="L11" drawlabel="true">
<Input>
<Text-field style="Text" layout="Normal">If kappa has a minimum or maximum, its derivative must be zero there.</Text-field>
</Input>
</Group>
<Group labelreference="L9" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">kappaprime:=simplify(diff(kappa,t));</Text-field>
</Input>
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="Pkkra2FwcGFwcmltZUc2IiwkKioiIzciIiItSSRzaW5HNiQlKnByb3RlY3RlZEdJKF9zeXNsaWJHRiQ2I0kidEdGJEYoLCYtSSRjb3NHRitGLkYoIiIjRihGKCksJiomIiIlRihGMUYoRigiIiZGKCNGOEYzISIiRig=">LCQqKC1JJHNpbkc2JCUqcHJvdGVjdGVkR0koX3N5c2xpYkc2IjYjSSJ0R0YpIiIiLCYtSSRjb3NHRiZGKkYsIiIjRixGLCwmRi4iIiUiIiZGLCMhIiZGMCIjNw==</Equation></Text-field>
</Output>
</Group>
<Group labelreference="L12" drawlabel="true">
<Input>
<Text-field style="Text" layout="Normal">If the derivative is zero, the numerator must be zero.</Text-field>
</Input>
</Group>
<Group labelreference="L10" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">zero:=numer(kappaprime);</Text-field>
</Input>
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="PkklemVyb0c2IiwkKigiIzciIiItSSRzaW5HNiQlKnByb3RlY3RlZEdJKF9zeXNsaWJHRiQ2I0kidEdGJEYoLCYtSSRjb3NHRitGLkYoIiIjRihGKEYo">LCQqJi1JJHNpbkc2JCUqcHJvdGVjdGVkR0koX3N5c2xpYkc2IjYjSSJ0R0YpIiIiLCYtSSRjb3NHRiZGKkYsIiIjRixGLCIjNw==</Equation></Text-field>
</Output>
</Group>
<Group labelreference="L13" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal"></Text-field>
</Input>
</Group>
<Group labelreference="L14" drawlabel="true">
<Input>
<Text-field style="Text" layout="Normal">This expression is zero if one of the two factors is zero.  But cos(t)+2 is never zero.  So kappaprime is zero if and only if sin(t) is zero, which happens exactly twice on [0,2*pi].</Text-field>
</Input>
</Group>
<Group labelreference="L15" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">plot(zero,t=0..2*Pi);</Text-field>
</Input>
<Output>
<Text-field style="Maple Plot" layout="Maple Plot"><Plot height="400" type="two-dimensional" width="400" plot-scale="1.0" plot-xtrans="0.0" plot-ytrans="0.0" gridlinevisibility="1" legendvisibility="false">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</Plot></Text-field>
</Output>
</Group>
<Group labelreference="L16" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal"></Text-field>
</Input>
</Group>
<Group labelreference="L27" drawlabel="true">
<Input>
<Text-field style="Heading 1" layout="Heading 1">Problem 5.</Text-field>
</Input>
</Group>
<Group labelreference="L23" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">x:=&lt;a*v*cos(u),a*v*sin(u),b*u&gt;;</Text-field>
</Input>
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="PkkieEc2Ii1JJ1JUQUJMRUdGJDYlIihnRWgqLUknTUFUUklYR0YkNiM3JTcjKihJImFHRiQiIiJJInZHRiRGMC1JJGNvc0c2JCUqcHJvdGVjdGVkR0koX3N5c2xpYkdGJDYjSSJ1R0YkRjA3IyooRi9GMEYxRjAtSSRzaW5HRjRGN0YwNyMqJkkiYkdGJEYwRjhGMCZJJ1ZlY3RvckdGNDYjSSdjb2x1bW5HRiQ=">LSZJJ1ZlY3Rvckc2JCUqcHJvdGVjdGVkR0koX3N5c2xpYkc2IjYjSSdjb2x1bW5HRig2Iy9JJCVpZEdGKCIoZ0VoKg==</Equation></Text-field>
</Output>
</Group>
<Group labelreference="L24" drawlabel="true">
<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">xu:=map(diff,x,u); xv:=map(diff,x,v);</Text-field>
</Input>
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="PkkjeHVHNiItSSdSVEFCTEVHRiQ2JSIpayRRNCItSSdNQVRSSVhHRiQ2IzclNyMsJCooSSJhR0YkIiIiSSJ2R0YkRjEtSSRzaW5HNiQlKnByb3RlY3RlZEdJKF9zeXNsaWJHRiQ2I0kidUdGJEYxISIiNyMqKEYwRjFGMkYxLUkkY29zR0Y1RjhGMTcjSSJiR0YkJkknVmVjdG9yR0Y1NiNJJ2NvbHVtbkdGJA==">LSZJJ1ZlY3Rvckc2JCUqcHJvdGVjdGVkR0koX3N5c2xpYkc2IjYjSSdjb2x1bW5HRig2Iy9JJCVpZEdGKCIpayRRNCI=</Equation></Text-field>
</Output>
<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="PkkjeHZHNiItSSdSVEFCTEVHRiQ2JSIpZygqUTYtSSdNQVRSSVhHRiQ2IzclNyMqJkkiYUdGJCIiIi1JJGNvc0c2JCUqcHJvdGVjdGVkR0koX3N5c2xpYkdGJDYjSSJ1R0YkRjA3IyomRi9GMC1JJHNpbkdGM0Y2RjA3IyIiISZJJ1ZlY3RvckdGMzYjSSdjb2x1bW5HRiQ=">LSZJJ1ZlY3Rvckc2JCUqcHJvdGVjdGVkR0koX3N5c2xpYkc2IjYjSSdjb2x1bW5HRig2Iy9JJCVpZEdGKCIpZygqUTY=</Equation></Text-field>
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<Text-field prompt="&gt; " style="Maple Input" layout="Normal">simplify(LinearAlgebra[Norm](LinearAlgebra[CrossProduct](xu,xv),2,conjugate=false));</Text-field>
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<Output>
<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="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">KiQqJkkiYUc2IiIiIywmKiRJImJHRiVGJiIiIiomRiRGJkkidkdGJUYmRipGKiNGKkYm</Equation></Text-field>
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<Text-field style="Text" layout="Normal">Since a&gt;0 and b&gt;0, the above expression is at least as large as ab, and therefore is non-zero. So x is regular.</Text-field>
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<Text-field style="Heading 1" layout="Heading 1">Problem 6.</Text-field>
</Input>
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<Input>
<Text-field prompt="&gt; " style="Maple Input" layout="Normal">x:=u*v;</Text-field>
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<Text-field style="2D Output" layout="Maple Output"><Equation executable="false" style="2D Output" display="PkkieEc2IiomSSJ1R0YkIiIiSSJ2R0YkRic=">KiZJInVHNiIiIiJJInZHRiRGJQ==</Equation></Text-field>
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<Text-field style="Text" layout="Normal">Note that the coordinate curves are themselves lines.  When we plot in maple, we get to see the coordinate curves.  So the following plot shows the ruilings on this doubly ruled surface.</Text-field>
</Input>
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<Text-field prompt="&gt; " style="Maple Input" layout="Normal">plot3d(x,u=-2..2,v=-2..2);</Text-field>
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<Output>
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<Text-field prompt="&gt; " style="Maple Input" layout="Normal"></Text-field>
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