15问答网 > 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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