已知 π→ =（sinB，1﹣cosB）， n→ =（2，0），且 m→,n→ 的夹角为 π3 ，其中A，B，C为△_刷题宝

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已知 π→ =（sinB，1﹣cosB）， n→ =（2，0），且 m→,n→ 的夹角为 π

3

，其中A，B，C为△ABC的内角．

上一题下一题 0.0难度选择题更新时间:2015-10-28 04:03:32

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