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sin75°•cos30°-sin15°•cos60°的值为 .
sin75°•cos30°-sin15°•cos60°的值为 .
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已知函数
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满足f′(x)>f(x),则f(1)与ef(0)的大小关系为( )
A.f(1)=ef(0)
B.f(1)<ef(0)
C.f(1)>ef(0)
D.不能确定
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函数f(x)=Asin(ωx+φ),(A,ω,φ是常数,
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的部分图象如图所示,则ω,φ的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717013754/SYS201311031010257170137008_ST/images1.png)
A.
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B.
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C.
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D.
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已知f:x→-sin x是集合A(A⊆[0,2π])到集合B={0,
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}的一个映射,则集合A中的元素个数最多有( )
A.4个
B.5个
C.6个
D.7个
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已知△ABC中,
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,B=45°,则角A等于( )
A.150°
B.90°
C.60°
D.30°
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若函数y=x
3+x
2+mx+1是R上的单调函数,则实数m的取值范围是( )
A.(
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,+∞)
B.(-∞,
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]
C.[
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,+∞)
D.(-∞,
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)
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