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<body class='hmmessage'><div dir='ltr'>Dear members, <br><br>In plotting a geometric locus I got a piece of <br>a perpendicular bisector that is an extreme <br>case that does not belong to the locus and as <br>such shouldn't show up in the plot. <br><br>How can I get rid of it? Only the "elipse" should appear. <br>Thank you. <br>Luis <br><br>\begin{figure}<br>\begin{center}<br>\setlength{\fboxrule}{1pt}\setlength{\fboxsep}{2.73mm}<br>\fbox{%<br>\psset{xunit=1.0cm,yunit=1.0cm,algebraic=true,dotstyle=o,dotsize=3pt 0,linewidth=0.8pt,arrowsize=3pt 2,arrowinset=0.25}<br>\begin{pspicture*}(-5.8,-4.6)(5.6,4.6)<br>\pspolygon[linestyle=none,fillstyle=solid,fillcolor=yellow!20,opacity=0.1](-2.375,3.4977671449)(-2.5,0)(2.5,0)<br>\psplotImp[algebraic,linecolor=red,linewidth=0.8pt](-5.8,-4.6)(5.6,4.6){%<br>sqrt(5^4-8*5^2*x^2+16*x^4+8*5^2*y^2+32*x^2*y^2+16*y^4)*(-5^2+sqrt(5^4-8*5^2*x^2+16*x^4+8*5^2*y^2+%<br>32*x^2*y^2+16*y^4)+4*x^2-4*y^2)-32*3.8965145303^2*x^2}<br>\parametricplot[linecolor=magenta]{-0.16953679806865107}{3.3101351699722725}{1*4.2278836313*cos(t)+0*4.2278836313*sin(t)+0|0*4.2278836313*cos(t)+1*4.2278836313*sin(t)+0}<br>\psline[linewidth=1.2pt](-2.5,0)(2.5,0)<br>\psline[linewidth=1.2pt](-2.375,3.4977671449)(2.5,0)<br>\psline[linewidth=1.2pt](-2.375,3.4977671449)(-2.5,0)<br>\psplot{-6.6411207657}{-2.5}{(-0-0*x)/-3.3049159284}<br>\psplot{2.5}{6.7033147624}{(-0-0*x)/3.1057959135}<br>\psline[linecolor=blue](-2.375,3.4977671449)(-0.6578947368,0)<br>\rput[tl](-0.20,-0.12){$\magenta{M_{_a}}$}<br>\rput[tl](-0.86,-0.12){$\blue{D_{_{\!a}}}$}<br>\rput[tl](-1.23,1.58){$\blue{\mathfrak{d}_{_{\!a}}}$}<br>\rput[tl](5.20,-1.95){$\red{\mathfrak{C}}$}<br>\rput[tl](1.65,4.35){$\magenta{\phi_{_1}}$}<br>\rput[tl](-3.58,-0.12){$\mathfrak{a}$}<br>\psdots[dotstyle=*,linecolor=blue](-2.375,3.4977671449)<br>\rput[bl](-2.52,3.70){$A$}<br>\psdots[dotstyle=*,linecolor=blue](-2.5,0)<br>\rput[bl](-2.63,-0.37){$B$}<br>\psdots[dotstyle=*,linecolor=blue](2.5,0)<br>\rput[bl](2.36,-0.37){$C$}<br>\psdots[dotsize=2pt 0,linecolor=blue](-0.6578947368,0)<br>\psdots[dotsize=2pt 0,linecolor=magenta](0,0)<br>\rput[tc](-0.1,-4.4){Triangle dados \texttt<$\,a,m_{_a},d_{_a}$\texttt>}<br>\end{pspicture*}}<br>\caption{Exercicio 169 --- Quarto procedimento.}<br>\label{figuraexer169c}<br>\end{center}<br>\end{figure}<br><br><br> </div></body>
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