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若{an}为等差数列,Sn是其前n项和,且,则tana6的值为A.B.C.D.
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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的值为( )
A.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACoSURBVDhPzZC7DQQhDAVdFwHlkNMJMYWQUsgG
LuUdxl4JpN07ILqRLFmYkT+EB4hoLez/hBRW+HeZM7zsKBGrPS7JFdFn8J232u3/lplNVGrckUdq
3B1bkY4HOw/Y4XzWRfbkBmcPsgMSStBxKGi18U0e96ZSSk+SI7h09fxdZmT/dO0+gXafZOnUJ9MY
7jXvHFpRur93npl+XcmBXDqTBel+LAtrMvABvDKYogJWgwAAAAAASUVORK5CYII=
)
B.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAASCAYAAACw50UTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC9SURBVDhP5ZK7DcQgDEA9FwXj0LMJNYPQMkgK
j+LD4JzMKR+SI1WeZAXxebENQDcAgLGQ/ZfggyO8XY6RLPeYw2eZnCLP5G0kXMdlbfX/L0cUcSP7
mXJN9n1b+E+1V1uhNmp47ZevZ27PFXKxNrZGzZUXMFoCueBzeXKtXHAycSzXfT+Vp5TqNxggE5Y6
3pcjRXvntdQKWvadnDOtlbXQb2BcXnDlMGe/n3nPJfkSDIEJz8gZzv4xOTMmJ/oAK4PA+BPDOy4A
AAAASUVORK5CYII=
)
C.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAASCAYAAABM8m7ZAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADOSURBVEhLzZKxDcQgDEU9FwXj0LMJNYPQMkgK
RvHFxpEgEsGn45I8yQpywJ9vDLgYANCF7F8GFdXwTmFtkZb3CJeIds9RHnyW5N+FM3obsRzr/d+h
3VXmW01iRrenFBGtZD8QPqMROjM8k/2dra6QU8rfLszIkNlYm/995QlXly3RIsiwdbu4HZPoSE7y
ThLXwu07/+Q4pcTfYABN2Hg9Fi4YrXKq1bDz6roTJofckRrNbK17Y7cXJtdjxz3LhLdgEEy4X5gg
148IEzphxA9K84Tu+9K6XQAAAABJRU5ErkJggg==
)
D.
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