若{an}為等差數(shù)列,Sn是其前n項(xiàng)和,且S11=22π3,則tana6的值為( ?。?A.3 B.?3 C.±3 D.?33
若{a
n}為等差數(shù)列,S
n是其前n項(xiàng)和,且
S11=,則tana
6的值為( ?。?br/>A.
B.
?C.
±D.
?
優(yōu)質(zhì)解答
∵
S11==11a6=∴
a6=∴
tana6=?,
故選B.
我來(lái)回答
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