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已知数列{an}为等差数列,且a1+a7+a13=4π,则tan(a2+a12)...
已知数列{a
n}为等差数列,且a
1+a
7+a
13=4π,则tan(a
2+a
12)的值为( )
A.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100020168521697/SYS201311031000201685216009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100020168521697/SYS201311031000201685216009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100020168521697/SYS201311031000201685216009_ST/2.png)
D.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100020168521697/SYS201311031000201685216009_ST/3.png)
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