【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】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】若 cos(α-β)= 1 7 ,cos2α=- 11 14 ,且 α∈(0, π 2 ) ,β∈(- π 2 ,0) ,则α+β等于( )
【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=______.