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</algebraView>
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<construction title="" author="" date="">
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<ggbscript val="SetValue(a,!a)
If(a==true,SetCaption(button1,"取消跟踪"),SetCaption(button1,"跟踪"))
ZoomIn(1)
SetTrace(D,a)"/>
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<caption val="取消跟踪"/>
</element>
</construction>
</geogebra>
