【简答题】已知∴ f(α)= 2cos( π 2 -α)+sin(2α-π) 4cos α 2 sin α 2 (1)化简f(α); (2)若 sinα= 4 5 ,且α∈(0,π),求f(α)的值.
【单选题】关于骨盆狭窄的诊断,哪项是错误的
E.
骨盆出口横径+后矢状经=15cm属于正常范围
【单选题】Deficit, Debt, and Entitlements Well it's the group of people born between 1961 and 1981. It seems that we have come to be called Xers simply because we represent something negative to our elders. We ...
A.
be speaking very highly of his own Generation
B.
be sympathetic with his own generation
C.
criticise his own generation for its shortcomings
D.
believe bis previous generations share one thing
【单选题】关于骨盆狭窄的诊断,哪项是错误的
E.
骨盆出口横径+后矢状经>15cm属于正常范围
【单选题】对装修管理应注意的问题表述不正确的是()。
A.
服务与控制是装修管理过程的一对矛盾,如何处理充分体现了物业管理的水平与技巧
B.
验收工作是装修管理的最后一道工序,也是控制违章的最后一关
C.
对于在物业装饰装修过程中的违规违约行为,应根据相关法规、管理规约及物业装饰装修管理服务协议进行处理
【单选题】Where is the group of people?
【单选题】关于骨盆狭窄的诊断,哪项是错误的
E.
骨盆出口横径+后矢状径=15Cm属于正常范围
【单选题】关于骨盆狭窄的诊断,哪项是错误的
E.
骨盆出口横径+后矢状经=15Cm属于正常范围
【简答题】若sin2α= 1 4 ,且α∈( π 4 , π 2 ) 则cosα-sinα=______.
【简答题】已知 tanα=- 1 3 , α∈( π 2 ,π) . (1)化简 sin2α-co s 2 α 1+cos2α ,并求值. (2)若β∈( π 2 ,π ),且cos(α+β)=- 12 13 ,求sin(α+β)及cosβ的值.