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若a=sin2π7,b=tan5π7,c=cos5π7,则( )A.a<b<cB.a<c<bC.b<c<aD.c<b<
若a=sin2π7,b=tan5π7,c=cos5π7,则( )A.a<b<cB.a<c<bC.b<c<aD.c<b<
2024-12-01 08:52:27
推荐回答(1个)
回答1:
∵0<
2π
7
<
π
2
,
π
2
<
5π
7
<
3
4
π,
∴备培a=sin
2π
7
>0,tan
5π
7
<cos
5π
7
<0,
∴b<仿让唯c<a,滑扮
故选:C.
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