【简答题】设sin = ,则sin 2 θ = .
【简答题】已知sin(π﹣α)=﹣2sin( +α),则sinα·cosα=( )
【单选题】Delimbing gate works as ______.
A.
Single-stem delimbing with transverse feeding
B.
Multi-stem delimbing with lengthwise feeding
C.
Multi-stem delimbing with transverse feeding
【简答题】已知 sinθ+cosθ sinθ-cosθ =2 ,则sin2θ=______.
【单选题】在谈及俄罗斯出兵乌克兰时,美国《芝加哥论坛报》认为:“这是美国与欧洲的慕尼黑时刻。”下列对发生在“一个世纪以前的‘慕尼黑时刻’”评述不正确的是
【简答题】若 sinθ+cosθ sinθ-cosθ =2,则sin(θ-5π)?sin ( 3π 2 -θ) =______.
【单选题】Stem Cell Therapy May Help Repair the Heart According to scientists in the USA, stem cell therapy may one day be able to repair the hearts of people with heart failure. Researchers at Pittsburgh Unive...
【单选题】Why do some people oppose stem cell research according to the man?
A.
They don't know about the benefits of the research.
B.
The research goes against their religious beliefs.
C.
The research costs too much money.
D.
They insist that the research is against nature.
【简答题】已知tan(π+α)=2,则 sinα+sin( π 2 +α) sinα+cos(π-α) =______.
【简答题】已知sin(π-α)=-2sin( π 2 +α),则sinα?cosα=______.