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若{an}为等差数列,Sn是其前n项和.且,则tana6=________.
试题详情
若{a
n}为等差数列,S
n是其前n项和.且
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAD8AAAAjCAYAAAAjS9I/AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
,则tana
6=________.
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