【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=______.
【简答题】已知sin(3π-α)=-2sin( +α),则sinαcosα=( )。
【简答题】若 sinθ+cosθ sinθ-cosθ =2,则sin(θ-5π)?sin ( 3π 2 -θ) =______.
【简答题】普通钢筋按外形来分可分为( )钢筋和( )钢筋。
【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...
【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=______.