示例：在绘图中使用值域变量

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            <gridLabels display="true" />
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            <tickMarks display="true" />
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          <numberFormat>
            <decimal precision="3" show-trailing-zeros="false" radix="dec" imaginary-value="i" />
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                  <id>sin</id>
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值域变量	Y 轴表达式	X 轴表达式
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